Oil Catch Cans & Breather Tanks

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Normally, the PCV (positive crankcase ventilation)...

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Normally, the PCV (positive crankcase ventilation) valve uses intake vacuum to relieve the pressure inside your crankcase, but that can result in oil mist and other blow-by contaminants building up on the valve and pistons, especially in direct-injection engines. An oil catch can (sometimes called an air/oil separator) is installed between the PCV valve and the intake, where it removes contaminants and allows only clean air to return to the intake manifold. Some have a reservoir that needs to be drained...

Oil catch cans and breather tanks look similar and do similar jobs, but they serve different purposes.

Oil Catch Cans

Breather Tanks

In forced induction and racing applications, the build-up of crankcase pressure can be much greater, so a breather tank is designed to vent that excess pressure into the atmosphere. They capture some blow-by with a catch can and air filter, and they may have an oil return. Importantly, breather tanks may not meet local emissions standards.

Top Brands

These devices are easy insurance for your high performance engine, and some builders use both a catch can and a breather tank. Summit Racing Equipment carries catch cans from trusted brands like Moroso, Mishimoto, Canton Racing, Ford Performance, JLT Performance, and many more.

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Moroso PCV Air/Oil Separators 85723

Oil Catch Can, Harley-Davidson®, Milwaukee Eight, Black, Stock Air Cleaner, Screaming Eagle Air Cleaner, Kit

Part Number: MOR-85723

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85722

Oil Catch Can, Harley-Davidson®, Milwaukee Eight, Polished, Stock Air Cleaner, Screaming Eagle Air Cleaner, Kit

Part Number: MOR-85722

Not Yet Reviewed

Estimated Ship Date: Nov 14, 2025 if ordered today

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Estimated Ship Date: Nov 14, 2025 if ordered today

Moroso PCV Air/Oil Separators 85714

Oil Catch Can, Harley-Davidson®, Twin Cam, Black, Stock Air Cleaner, Kit

Part Number: MOR-85714

Not Yet Reviewed

Estimated Ship Date: Nov 14, 2025 if ordered today

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Estimated Ship Date: Nov 14, 2025 if ordered today

Moroso PCV Air/Oil Separators 85717

Oil Catch Can, Harley-Davidson®, Twin Cam, Black, Vance and Hines V02 Air Cleaner, Kit

Part Number: MOR-85717

Not Yet Reviewed

Estimated Ship Date: Nov 14, 2025 if ordered today

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Estimated Ship Date: Nov 14, 2025 if ordered today

Moroso PCV Air/Oil Separators 85474

Air, Oil, Separator Tank, Aluminum, Polished, 3 in. Diameter, 4 in. Height, Kit

Part Number: MOR-85474

4.76 out of 5 stars ( 46 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85481

Air, Oil, Separator Tank, Aluminum, Polished, 3 in. Diameter, 4 in. Height, Chevy, GMC, Hummer, Kit

Part Number: MOR-85481

4.69 out of 5 stars ( 61 )

Estimated Ship Date: Tomorrow

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Radium Engineering Catch Can Kits 200772

Air Oil Separator-Return Dual, PCV, Crankcase, 7 oz. Capacity, -6 AN, Billet Aluminum, Black, Honda, S2000, Kit

Part Number: RDM-200772

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85497

Air, Oil, Separator Tank, Round, Aluminum, Black Anodized, Rubber Hose, Mounting Clamp, Kit

Part Number: MOR-85497

4.71 out of 5 stars ( 21 )

Estimated Ship Date: Tomorrow

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Radium Engineering Catch Can Kits 20-0008-FL

Universal Catch Can, 7 oz. Capacity, -10 AN O-Ring, Billet Aluminum, Black, Each

Part Number: RDM-20-0008-FL

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85531

Oil Catch Cans, Air/Oil Separator Tank, Aluminum, Black Anodized, Large Body, Kit

Part Number: MOR-85531

4.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Radium Engineering Catch Can Kits for 1997-2004 CORVETTE - 20-0260-FL

Radium Engineering Catch Can Kit GM LS Engine Fluid Lock

Part Number: RDM-20-0260-FL

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators for 1997-2004 CORVETTE - 85516

Air, Oil, Separator Tank, Aluminum, Polished, 2.875 in. Diameter, 4.5 in. Height, Chevy, Kit

Part Number: MOR-85516

4.67 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Radium Engineering Universal Catch Cans 20-0072

Oil Catch Can, Universal Catch Can, Round, 20 oz. Capacity, Aluminum, Black, Kit

Part Number: RDM-20-0072

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85496

Air, Oil, Separator Tank, Round, Aluminum, Natural, Mounting Clamp, Kit

Part Number: MOR-85496

4.6 out of 5 stars ( 20 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators for 2009-2014 CTS - 85603

Air, Oil, Separator Tank, Aluminum, Black Anodized, Cadillac, CTS-V, Kit

Part Number: MOR-85603

4.71 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85683

Separator Tank, PCV Air/Oil Separator, Round, Aluminum, Black Anodized, Clear Base, Small Body Separator Tank, Kit

Part Number: MOR-85683

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators for 2010-2015 CAMARO - 85487

Air, Oil, Separator Tank, Aluminum, Polished, 3 in. Diameter, 4 in. Height, Rubber Hose, Clamp, Chevy, Kit

Part Number: MOR-85487

4.81 out of 5 stars ( 32 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85533

Oil Catch Can, Aluminum, Black, 3 in. Diameter, 4 in. Height, Chevy, Each

Part Number: MOR-85533

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators for 2005-2013 CORVETTE - 85521

Separator Tank, PCV Air/Oil Separator, Round, Aluminum, Polished, Chevy, Kit

Part Number: MOR-85521

4.86 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators 85472

Air, Oil, Separator Tank, Aluminum, Polished, 3 in. Diameter, 4 in. Height, Chrysler, Dodge, Kit

Part Number: MOR-85472

4.7 out of 5 stars ( 30 )

Estimated Ship Date: Tomorrow

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Moroso PCV Air/Oil Separators for 2005-2013 MUSTANG - 85477

Air, Oil, Separator Tank, Aluminum, Polished, 3 in. Diameter, 4 in. Height, Ford, Kit

Part Number: MOR-85477

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Estimated Ship Date: Tomorrow

Radium Engineering Universal Catch Cans 20-0219

Air Oil Separator - Universal Kit

Part Number: RDM-20-0219

Not Yet Reviewed

Estimated Ship Date: Nov 6, 2025 if ordered today

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Estimated Ship Date: Nov 6, 2025 if ordered today

Moroso PCV Air/Oil Separators 85529

Oil Catch Cans, PCV Air/Oil Separators, Round, 7.5 oz. Capacity, Aluminum, Natural, 3/8 in. Hose Barb, Chevrolet, GMC, 5.3L, 6.2L, Gen V, Kit

Part Number: MOR-85529

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Nov 14, 2025 if ordered today

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Estimated Ship Date: Nov 14, 2025 if ordered today

Moroso PCV Air/Oil Separators for 2014-2019 CORVETTE - 85524

Oil Catch Cans, PCV Air/Oil Separators, Round, 7.5 oz. Capacity, Aluminum, Polished, 3/8 in. Hose Barb, Chevrolet, 6.2L Small Block Gen V, Kit

Part Number: MOR-85524

Not Yet Reviewed

Estimated Ship Date: Nov 13, 2025 if ordered today

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Estimated Ship Date: Nov 13, 2025 if ordered today

Moroso PCV Air/Oil Separators 85682

Separator Tank, PCV Air/Oil Separator, Round, Aluminum, Clear Anodized, Clear Base, Small Body Separator Tank, Kit

Part Number: MOR-85682

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Nov 14, 2025 if ordered today

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Estimated Ship Date: Nov 14, 2025 if ordered today

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