Compressor Part Number Lookup: How to Find the Right Replacement Part

What Compressor Part Numbers Tell You, and What They Don’t

A compressor part number can tell you a lot.

It can point you toward the original equipment manufacturer. It can help identify whether you are looking at an air filter, oil filter, air/oil separator, lubricant, valve kit, gasket kit, belt, pressure switch, drain valve, or another replacement part. It can even hint at whether the machine is a stationary rotary screw compressor, portable rotary screw compressor, air-cooled reciprocating compressor, dryer, blower, vacuum pump, or air treatment component.

But a part number is not the whole story.

In the compressed air world, part numbers are clues. Good clues. Useful clues. Sometimes very specific clues. But they are not always proof that a part fits your exact machine.

A part number can help you start the search, but the compressor model and serial number often determine whether that part actually fits your machine.

That is where a lot of bad orders start. Someone finds a number on an old filter, a manual, a tag, a housing, a previous invoice, or an internet listing and assumes the search is over. Sometimes it is. Sometimes it is not.

Compressor parts are tied to models, serial number ranges, machine revisions, package designs, engine configurations, cooling styles, and brand histories that are not always obvious from the number alone.

So yes, start with the part number. Just do not stop there.

What Is a Compressor Part Number?

A compressor part number is an identifying number assigned to a component used in or around a compressed air system. That component may be an OEM part, an aftermarket replacement part, a maintenance item, a repair part, a lubricant, or an accessory.

Common compressor parts identified by part number include:

• Air filters
• Oil filters
• Air/oil separators
• Compressor oils and lubricants
• Gasket kits
• Valve kits
• Piston ring kits
• Pressure switches
• Drain valves
• Belts
• Intercooler tubes
• Coalescing filters
• Dryer and air treatment parts

The important word is identifying. A part number helps identify a part. It does not automatically confirm that the part belongs on your exact compressor.

What Compressor Part Numbers Can Tell You

Part numbers are useful because manufacturers often follow patterns. Those patterns can help identify the brand, the type of part, and sometimes the type of machine involved.

1. A Part Number Can Suggest the OEM

Many compressor manufacturers use recognizable part number formats. These formats are not perfect, and there are always exceptions, but they can point you in the right direction.

For example, Ingersoll Rand part numbers are commonly 8 or 11 digits. Sullair part numbers often begin with 0225 or 250. Atlas Copco part numbers are commonly 10 digits and may appear with spaces in catalogs. Kaeser frequently uses part number formats with dots, such as #.####.# or #.####E#. BOGE part numbers often end with the letter P.

Those patterns matter because they can help separate an Ingersoll Rand number from a Sullair number, an Atlas Copco number from a Quincy number, or a compressor part from an air treatment part.

2. A Part Number Can Suggest the Part Category

Some part numbers are strongly associated with common maintenance parts. If the number appears in a compressor manual or on a previous invoice, it may help identify whether the customer needs an air filter, oil filter, separator, lubricant, kit, valve, or other replacement item.

That is especially helpful for preventative maintenance items. Rotary screw compressors commonly use air filters, oil filters, air/oil separators, and compressor oil. Air-cooled reciprocating compressors often involve air filters, gasket kits, valve kits, piston rings, pressure switches, and reciprocating compressor oil.

But the category still matters. An air filter number does not help much if the customer actually needs the filter housing. A valve kit number does not help much if the customer needs a pressure switch. A number from a separator label does not help if the machine is an air-cooled reciprocating compressor that does not use separators at all.

3. A Part Number Can Suggest the Type of Compressor

Some numbers and naming patterns point toward certain machine types.

For example, many Ingersoll Rand Type 30 air-cooled reciprocating compressor parts start with 32. Quincy part numbers with an X may also point toward air-cooled reciprocating compressor parts. Sullivan-Palatek may use an S at the end of certain filter or separator numbers to indicate a secondary element.

These clues can help narrow the search, but they should not replace machine identification. A part number might suggest “portable rotary screw compressor” or “air-cooled reciprocating compressor,” but the model and serial number are still what help confirm the correct fit.

Common Compressor Part Number Patterns by Brand

The following examples are helpful patterns, not universal rules. Compressor manufacturers have used different formats over time, and acquisitions have changed how some parts are sourced or labeled.

Ingersoll Rand Part Numbers

Ingersoll Rand compressor part numbers are often 8 or 11 digits. Type 30 air-cooled reciprocating compressor parts commonly begin with 32. Ingersoll Rand also has portable compressor part numbers that may still appear even when the part is now associated with Doosan or Doosan Bobcat sourcing.

One important note: Ingersoll Rand may use different wording than customers expect. For example, an oil filter may be called a coolant filter in some contexts. That does not mean it is a different kind of maintenance item. It means the manufacturer’s terminology may be different from the user's everyday language.

Gardner Denver Part Numbers

Gardner Denver part numbers often include letters in the middle of the number. The exact format can vary, but embedded letters are a common clue. Gardner Denver-related brands and acquired lines may also create variation in the way part numbers appear.

Sullair Part Numbers

Sullair part numbers often begin with 0225 or 250. Some customers leave off leading digits when reading or typing the number. That means the same part may be searched incorrectly if the leading zero, the 02, or the full 0225 prefix is missing.

For example, a Sullair number that should be searched as 02250155-709 may be given as 2250155-709, 250155-709, or only the last portion of the number. The customer may not be wrong about the number they see. The issue may be that the number is incomplete or formatted differently than the system expects.

With Sullair, the number may be right, but the formatting may be incomplete.

Atlas Copco Part Numbers

Atlas Copco part numbers are commonly 10 digits. They may appear in catalogs with spaces, but many systems store or search them without spaces.

For example, a number may appear visually as groups of digits in a manual but need to be entered as one continuous number when searching online.

Quincy Part Numbers

Quincy part numbers can be especially confusing because older numbers are still used in the field while many newer numbers follow Atlas Copco-style 10-digit formats. Quincy was acquired by Atlas Copco, so customers may encounter both legacy Quincy numbers and newer formatted numbers depending on the machine, manual, and part type.

That means an old Quincy number is not automatically wrong. It may just need to be connected to the current replacement number.

Kaeser Part Numbers

Kaeser part numbers often follow dot-based formats such as #.####.# or #.####E#. Sometimes, the available information is a material number instead of the actual orderable part number. In those cases, the number may identify something in the manufacturer’s system without being enough to confidently order the correct part by itself.

Sullivan-Palatek Part Numbers

Sullivan-Palatek part numbers often include dashes or spaces, and many end with a dash followed by three or four digits. An S at the end of certain filter or separator numbers can indicate a secondary filter or separator.

This matters because primary and secondary elements are not interchangeable. A customer may have the right base number but still need the correct primary or secondary version.

BOGE Part Numbers

BOGE part numbers commonly end with the letter P. BOGE may also use different part names than customers expect. For example, an air filter may be called a suction filter, depending on the documentation.

Why Brand History Makes Compressor Part Numbers Confusing

Compressor part numbers do not exist in a neat, perfectly organized universe. Brands merge. Product lines get acquired. Manufacturers rename divisions. Old compressors stay in service for decades. Manuals get copied. Part numbers remain in circulation long after the business relationship around them has changed.

That is why you may have a valid part number but still be confused about the brand behind it.

For example, Doosan acquired a significant portion of Ingersoll Rand’s portable compressor division, including Bobcat. Some Ingersoll Rand portable compressor part numbers continued to be used even though the sourcing path changed. Chicago Pneumatic and Quincy became part of Atlas Copco. Sullivan Industries and Palatek Corporation merged to form Sullivan-Palatek.

This is one reason compressor part lookup can feel inconsistent. The number may be real. The machine may be real. The part may still be available. But the brand name, sourcing path, or current replacement number may not match what you expect.

What Compressor Part Numbers Do Not Tell You

This is the part that matters most.

A compressor part number may help identify a part, but it does not always confirm fitment. Fitment often depends on the compressor model, serial number, production range, package configuration, and machine type.

That means you can search the right number and still need a different answer depending on your machine. For example, Sullair conversion kit replacement 02250212-657 has different fitment paths depending on the compressor’s serial number or production range. One version applies to compressors with serial numbers prior to 2019, while another version applies to compressors with serial numbers after 2019.

That is why the number alone is not always enough. The machine details decide which version actually fits.

1. A Part Number Does Not Always Confirm the Exact Model

One part number may be used across several compressor models. That is common with filters, separators, oils, belts, and certain maintenance items.

Shared usage is convenient, but it can create false confidence. Just because a part number appears near your model online does not mean every part on that page fits your exact compressor.

2. A Part Number Does Not Always Confirm the Serial Number Range

Serial number breaks matter. Manufacturers change components during production. A compressor built before a certain serial number may use one filter, kit, or separator. A compressor built after that serial number may use another.

This is especially important for rotary screw compressors, where package changes, horsepower differences, cooling design, and production revisions can affect parts.

3. A Part Number Does Not Tell You Whether the Machine Has Been Modified

Older compressors may have been repaired, rebuilt, converted, or modified over time. A previous owner may have installed a different filter housing, changed an engine component, used a substitute part, or installed something that worked “well enough” but was not the original part.

If you copy the number from the old part, you may be copying a mistake.

4. A Part Number Does Not Always Tell You Where the Part Belongs

Compressed air systems include more than the compressor itself. A part number may belong to:

• The compressor package
• The engine on a portable compressor
• The air dryer
• A condensate drain
• A coalescing filter
• An oil/water separator
• An air receiver or accessory
• A vacuum pump or blower

That distinction matters. A customer may say “compressor filter” when the number actually belongs to an air dryer, inline filter, or engine air filter.

Sometimes the number is technically real, but it does not point to what the customer actually needs. For instance, customers may search the model or number printed on an Ingersoll Rand filter housing when they actually need the replacement filter element inside that housing. In that case, the housing information is still useful, but it is a clue that helps identify the element, not necessarily the part they need to buy.

5. A Part Number Does Not Prove the Number Was Copied Correctly

Part numbers are easy to misread. A zero can look like the letter O. A one can look like the letter I. A dash may be skipped. A suffix may be left off. A leading zero may disappear. A customer may read the number from a dirty label, faded tag, old invoice, or low-resolution photo.

One missing digit can turn a good part search into a dead end.

6. A Part Number Does Not Tell You Whether It Is Obsolete or Superseded

Some part numbers are old. Some have been replaced by newer numbers. Some still show up in manuals but are no longer the current orderable number. Some have valid replacements, while others require a more detailed lookup.

This is why an old number may still be useful, even if it is not the final number used to place the order.

Why Formatting Matters When Searching Compressor Part Numbers

The same compressor part number may appear in multiple formats depending on the manufacturer, catalog, website, invoice, manual, or internal system.

Common formatting differences include:

• Spaces between digit groups
• Dashes between number sections
• Dots in the part number
• Letters at the beginning, middle, or end
• Leading zeroes that customers accidentally leave off
• Manufacturer prefixes that get shortened or dropped
• Suffix letters that get missed
• Old numbers that cross to newer numbers
• Catalog formatting that differs from online search formatting

Sullair is one of the best examples. Many Sullair part numbers begin with 0225 or 250. But customers may leave off the leading zero, the 02, or even the full 0225 prefix when reading the number from a label, invoice, or old manual.

That means a number that should begin with 0225 may be typed as if it starts with 225. A customer may also provide only the last six digits and the dash suffix. The number may not be fake. It may just be missing the front end.

A similar issue can happen with Ingersoll Rand filter housings. The number or model on the housing may be accurate, but the customer may actually need the element inside the housing. If you are working from an Ingersoll Rand inline filter housing model, use our IR filter element selector to match the housing with the correct replacement element.

Atlas Copco numbers can create a different problem. They are commonly 10 digits, but they may appear in catalogs with spaces between digit groups. A customer may read the number with spaces, while an online system may require the number to be entered without spaces.

Kaeser numbers often use dots. Sullivan-Palatek numbers often use dashes or spaces. BOGE numbers may include a letter at the end.

The lesson is simple: when a compressor part number does not show up right away, the number may not be bad. It may just be incomplete, reformatted, or missing a small but important piece.

Why Compressor Type Matters

Part numbers become much more useful when they are paired with the type of compressor. A number by itself is helpful. A number plus machine type is better. A number plus brand, model, serial number, and machine type is best.

Stationary Rotary Screw Compressors

Stationary rotary screw compressors commonly use preventative maintenance parts such as air filters, oil filters, air/oil separators, and rotary screw compressor oil. These machines are often installed in manufacturing, packaging, food and beverage, metalworking, and industrial production environments.

Part numbers for stationary rotary screw compressors can be very useful, but model and serial number still matter. Package design, horsepower, cooling style, and production range can affect which parts belong on the machine.

Portable Rotary Screw Compressors

Portable rotary screw compressors are usually gas- or diesel-driven tow-behind units. They may require both compressor-side parts and engine-side parts.

That makes part numbers more complicated. A portable compressor may have a compressor air filter, an engine air filter, a compressor oil filter, an engine oil filter, a separator, fuel filters, belts, ignition parts, and other engine-related components.

For portable compressors, the compressor model is important. Engine information may also be important.

Air-Cooled Reciprocating Compressors

Air-cooled reciprocating compressors are piston-driven machines commonly used in smaller shops, auto body facilities, woodworking shops, car washes, dry cleaners, and general shop air applications.

These machines often use parts such as air filters, valve kits, gasket kits, piston rings, intercooler tubes, pressure switches, belts, and reciprocating compressor oil.

Many air-cooled reciprocating compressors do not have oil filters, and they typically do not use air/oil separators. That means a customer asking for an oil filter or separator for an air-cooled recip may be using the wrong terminology or may be looking at a different type of machine.

Why Model and Serial Number Still Matter

The model number tells you what compressor family or package you are working with. The serial number helps identify the specific production range, revision, or build of that machine.

That matters because manufacturers can change parts during production. A compressor built earlier in a series may use one air filter, oil filter, separator, valve kit, or maintenance kit, while a later machine in the same model family may use a different one.

Model and serial number are especially important for stationary rotary screw compressors, larger industrial machines, older equipment, and compressors with multiple package variations. They can also matter on portable compressors where engine configuration affects which parts are required.

In other words, the part number helps identify what the part might be. The model and serial number help confirm whether that part belongs on your exact machine.

Common Ways Customers End Up With the Wrong Part Number

Most wrong-part situations are not caused by carelessness. They are caused by incomplete information.

Here are some of the most common ways part number searches go sideways:

• The number came from a casting, housing, or bracket instead of the service part.
• The customer copied the model number instead of the part number.
• The customer copied the engine part number instead of the compressor part number.
• The old part installed in the machine was not the correct part.
• The manual does not match the exact machine revision.
• The part number was shortened, reformatted, or missing leading digits.
• The customer left off a suffix letter, dash, or secondary-element indicator.
• The number belongs to a dryer, drain, or inline filter instead of the compressor.
• The number is obsolete and needs to be crossed to a newer replacement.
• The part fits one version of the model but not every serial number range.

That is why part numbers are powerful, but not foolproof.

The Best Information to Use With a Compressor Part Number

If you want to identify a compressor part accurately, pair the part number with machine information.

The most useful information includes:

• Compressor brand: Ingersoll Rand, Atlas Copco, Sullair, Quincy, Kaeser, Gardner Denver, Sullivan-Palatek, Boge, Champion, Chicago Pneumatic, or another OEM.
• Model number: The compressor model or package model.
• Serial number: The machine serial number, especially for rotary screw compressors.
• Machine type: Stationary rotary screw, portable rotary screw, air-cooled reciprocating, water-cooled reciprocating, dryer, blower, vacuum pump, or air treatment product.
• Part category: Air filter, oil filter, separator, lubricant, gasket kit, valve kit, pressure switch, belt, drain, or another item.
• Photos: A clear photo of the data plate and the old part can help prevent confusion.
• Engine information: For portable compressors, engine make and model may be needed for engine-side parts.

The part number starts the search. The machine details confirm whether the part belongs there.

Use the Part Number to Search. Use the Machine to Confirm.

Here is the simplest rule:

A part number helps identify the part. The brand, model, and serial number help confirm the fit.

That rule prevents a lot of problems.

If you only have a part number, you may still be able to find a likely match. But if you have the part number, brand, model, and serial number, you have a much better chance of ordering the correct replacement part the first time.

This matters most when the compressor is expensive, production-critical, older, modified, portable, or tied to a specific serial number range.

Final Takeaway

Compressor part numbers are extremely useful. They can reveal brand patterns, identify common maintenance items, connect old numbers to current replacements, and help narrow a search quickly.

But they are not magic. They do not always confirm fitment. They do not always account for serial number breaks, machine revisions, modified packages, brand acquisitions, missing digits, formatting differences, or incorrect old parts.

So do not ignore the part number. Use it.

Just use it the right way.

Start with the number. Confirm with the machine.

Frequently Asked Questions About Compressor Part Numbers

Can I order compressor parts with only a part number?

Sometimes, yes. A clear part number can often identify a replacement part. But for the best fitment confidence, pair the part number with the compressor brand, model, and serial number.

Why does my compressor part number not show up when I search it?

Your part number may be formatted differently than the system expects. Some compressor part numbers include leading zeroes, dashes, spaces, dots, prefixes, or suffix letters. Sullair numbers, for example, often begin with 0225, but customers sometimes leave off the leading zero, the 02, or part of the prefix. If the number does not show up, try searching it with and without spaces, dashes, dots, and leading zeroes, then confirm it against the compressor brand, model, and serial number.

Why does my filter housing number not match the filter element I need?

The number or model on the housing may identify the filter housing, not the replaceable element inside it. Inline filters often require matching the housing size with the correct filtration grade. In many cases, customers do not need to replace the entire housing. They only need the element inside the housing.

Are OEM part numbers and replacement part numbers the same?

Not always. An OEM part number identifies the original manufacturer’s part. A replacement part number may identify an aftermarket equivalent, current replacement, or internal inventory item connected to that OEM number.

Why do some compressor part numbers have spaces, dashes, dots, or letters?

Different manufacturers use different numbering formats. Some brands use mostly digits, some use dots, some use dashes, and some include letters. Formatting can help identify the brand, but it does not prove fitment by itself.

Can the same part number fit more than one compressor?

Yes. Many filters, separators, oils, belts, and maintenance parts are used across multiple compressor models. That can be helpful, but the machine model and serial number should still be used to confirm compatibility.

Why do portable compressor part numbers get confusing?

Portable compressors often include both compressor-side parts and engine-side parts. The compressor may have one set of filters and oil, while the engine has another. Engine make and model may be needed for engine-related parts.

Do air-cooled reciprocating compressors use oil filters or separators?

Most air-cooled reciprocating compressors do not use air/oil separators, and many do not have oil filters. These machines more commonly use air filters, valve kits, gasket kits, piston rings, pressure switches, belts, and reciprocating compressor oil.

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