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Homebuilders Oil Breather / Separator

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Part# 10570
MFR Model# 10570


These 4 inch diameter reservoirs have beaded outlets for 5/8" I.D. hoses and a mounting flange for easy firewall attachment. These units are of a new, improved design and the reservoir body is now a spun aluminum bowl for optimum performance. The oil separators minimize oil loss and allow free breathing of the engine. They are recommended for experimental aircraft use only and are not STCd for any certificated aircraft.

Made in USA
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -



Well made

Tony A Verified Purchase


January 26, 2023

I have been using this oil separator for 17 years on my prototype turbocharged Yamaha snowmobile and it runs still today flawlessly thanks I would have posted a photo thanks GREGGO

March 20, 2022

Works well on my RV. Would be nicer if smaller.

Roy B
November 7, 2019

Nice product with quality construction. My one complaint is that the housing is not square with the mounting plate. Mine is clocked a little to the side so that in order for the 3/8 drain on the bottom to be center on the bottom it must be askewed a bit. Probably 1/4 to 3/8 off center at both mounting holes.

November 22, 2014


Please note,'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Do you have any installation literature on your 10570 home builders oil separator? We have one on an RV we just purchased and believe it is installed incorrectly. Thank you, Russ

We have added the installation and specification drawing to the "Specifications" tab of this web page. Please review it.

Q: What is the weight of this homebuilders oil beather / separator part # 10570?

Approx. 0.50 lbs.

Q: What engine size is it rated for say O-320. 0-540?

Unfortunately there is not an engine specific application guide available for this product.