Your cart is empty
Browse our catalog to find the parts you need.
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.
Blackmer · Hardware & Fasteners
711938
In stock · ships from Knoxville
This is a Blackmer Viton (FKM) O-ring, size 2-266, designed as a head seal for 3-inch positive displacement pumps.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 21 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
Fits 3-inch Blackmer pump models. Verify using the manufacturer’s parts list for your exact pump. The inventory title refers to a “3' VITON HEAD O-RING”; this is a typo — it is a 3-inch O-ring, not 3 feet.
Part data verified against 2 catalog sources
Numbers this part supersedes or interchanges with. Showing 1 of 1.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It sits between the pump head and casing to prevent fluid leaks. Replacing this O-ring is standard maintenance when rebuilding a pump or fixing leaks caused by a worn, hardened, or cracked seal. Note: Despite the “3'” notation in some listings, this is a 3‑inch pump O‑ring, not 3 feet.
Part Number: 711938
3' VITON HEAD O-RING
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
