Filtermart™ Separator Filters : Air Oil

Air Oil Separator Filters for Industrial Compressors

An air compressor oil separator filter isn't an optional extra; it's the component standing between clean, dry, usable compressed air and a system full of oil carryover. Skip a replacement cycle, and you're not just risking messy airlines. You're risking downstream contamination in pneumatic tools, added strain on your dryers and filters, and a slow, steady loss of the oil your compressor depends on to run cool and quiet.

Filtermart separator filter elements are built for continuous industrial duty: multi-layer microglass fiber media for high coalescing efficiency, corrosion-resistant metal end caps, high-strength support cores, and low initial pressure drop, so the compressor isn't working harder than it needs to.

Whether you call it an oil separator cartridge, a separator filter element, or simply an oil removal filter, it's doing the same essential job, stripping oil mist out of the airstream before it leaves the compressor.

Air Oil Separator Filter Replacement

Most separator elements have a working life measured in operating hours, but the real signal to watch is differential pressure. Once the pressure drop across the element climbs past the compressor manufacturer's recommended limit, usually somewhere in the 10-15 psi range.

It's time for an air oil separator filter replacement, regardless of the clock. Waiting past that point doesn't save money; it accelerates oil loss and adds strain on the compressor motor.

When replacement is needed:

• Differential pressure gauge reads at or above the manufacturer's limit
• Visible oil carryover in downstream lines, filters, or pneumatic tools
• Compressor running hotter than normal or consuming oil faster than usual
• Scheduled maintenance interval reached (typically 4,000-8,000 hours)

Identifying the correct element

The fastest way to identify the right replacement is the part number stamped on the housing or printed on the old element itself. That number cross-references directly to the correct Filtermartequivalent. If the part number isn't legible or the element has already been discarded, your compressor's make, model, and rated CFM (airflow) are usually enough for an accurate match.

Part-number matching

Cross-referencing by part number, rather than by compressor brand alone, avoids the two most common sizing mistakes: an undersized element that wears out early and lets oil through, or an oversized one that adds unnecessary pressure drop and cost. See the part number list below to check if your element is already cross-referenced.

Compressor compatibility

Air oil separator elements are not universal; media grade, micron rating, housing dimensions, and thread or gasket configuration all have to match the compressor. Filtermart cross-references against the major OEM and aftermarket numbers so a replacement fits and seals correctly the first time, without field modification.

Ordering and replacement process

• Confirm the part number (or make/model/CFM) for your compressor
• Check the cross-reference list or contactour team to verify fitment
• Order online, with volume pricing available for multiple units
• Install and reset differential pressure monitoring, if equipped

Air Oil Separator Filter Cross-Reference

FilterMart provides replacement filter cross-references by part number to help match existing compressor separator elements with compatible replacements. Commonly searched numbers include:

• 2204149801 and 77043014177
• 77041008012 and 250034-087
• 02250185-532 and 250034-085
• 1622035101 and 144606-01
• 250034-130 and 2911011700

If your part number isn't listed here or you're not sure which one applies, our team can confirm the correct cross-reference before you order.

Reliable Air Oil Separator Filters for Industrial Applications

Air oil separator filters aren't limited to one industry. Anywhere an oil-lubricated compressor is feeding a plant air system, these industrial separator filters are doing quiet, constant work behind the scenes:

• Manufacturing plants running pneumatic tools and automated assembly lines
• Food and beverage facilities where oil-free air protects product quality
• Oil and gas operations using compressed air for control instrumentation
• Fleet and fabrication shops relying on compressors for daily pneumatic work
• Packaging and processing lines where downstream contamination halts production

Because duty cycles and ambient conditions vary so much across these settings, replacement intervals aren't one-size-fits-all. A separator running in a dusty fabrication shop wears differently than one in a climate-controlled plant, which is why differential pressure matters more than a fixed calendar date.

Why Choose Oil Air Separator Filters from FilterMart

Find your part number in the Separator Filters catalog, or contact us for a fast cross-reference and quote. With over a million cross-references on file, we can usually confirm the right air oil separator filter for your compressor the same day.

When you buy air oil separator filters online through FilterMart, you get:

• Cross-referencing across major OEM and aftermarket part numbers
• Consistent build quality, microglass media, sealed end caps, rated support cores
• Straightforward pricing with volume discounts available on bulk orders
• Direct quote and ordering assistance if you're unsure of the correct part
• A wider catalog of related industrial filtration in one place

Beyond air-oil separation, our industrial filters section covers everything from coalescer filters to air filters, so if your compressed air system needs more than a separator element, you can source it in one order.

Frequently Asked Questions

What is an air oil separator?

An air oil separator is a filter element inside an oil-lubricated compressor that removes suspended oil droplets from the compressed air stream before it leaves the machine, protecting downstream equipment and conserving compressor oil.

What does an air oil separator filter do?

It coalesces fine oil mist into larger drops as compressed air passes through its media. Those drops collect and drain back into the compressor's oil sump, leaving the discharged air clean and largely oil-free.

When should an oil separator element be replaced?

Replace it when differential pressure across the element reaches the compressor manufacturer's limit, when oil carryover appears downstream, or at the scheduled maintenance interval, typically every 4,000 to 8,000 operating hours, whichever comes first.

How do I choose the correct replacement separator?

Match the part number from your current element or compressor manual against our cross-reference catalog. Without a part number, your compressor's make, model, and rated CFM are usually enough for our team to identify the correct fit.

What is the difference between an oil separator and an air filter?

An air filter removes solid particulate, dust, dirt, and debris from air entering the compressor intake. An oil separator works on the discharge side, removing oil droplets that get mixed into the air during compression. They handle different contaminants at different points in the system.

Why is oil carryover occurring in compressed air?

Oil carryover typically means the separator element is worn, clogged, undersized for the system's airflow, or nearing the end of its service life and no longer coalescing efficiently. Excessive sump oil level or the wrong replacement element can also contribute.

How do I identify an air oil separator by part number?

Check the part number printed on the element's end cap or housing label, then search it against our cross-reference catalog. If the number is worn off or unavailable, our team can identify the correct match from your compressor's make, model, and CFM rating.