These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.

Red Seal Neptune · Hardware & Fasteners
100139-010
In stock · ships from Knoxville
This is a Buna-N (Nitrile) O-Ring measuring approximately 1/8 inch cross-section by 2-1/2 inch inside diameter.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Verified application for Neptune/Red Seal Measurement petroleum and LPG metering equipment. This O-Ring is also listed as a flange gasket for 1-1/4 and 1-1/2 inch meter main casings. This is an industrial metering component, not a heavy-duty truck or trailer part.
Part data verified against 5 catalog sources
Different year, make, or config? Get a confirmation against your truck in under a minute.
It is primarily used as a strainer cover gasket or flange gasket on Neptune petroleum and LPG meters, specifically to create a leak-proof seal on the strainer housing and inlet flange connections. Replacing this O-Ring is typically part of routine meter maintenance when servicing the strainer assembly or if a leak develops at the cover or flange joint.
Part Number: 100139-010
O-RING 100139-010
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more