O-ring, 7.65 x 1.78 mm – Buna, Part#40015 – vacstellar

Description

Rietschle vacuum pumps like the VC400, VC500, and VC700 run hard in workshops and labs to pull steady vacuum. They have small grooves and ports inside where tiny seals do big jobs. This Buna O-ring, part number 40015, is one of those small black rings that fits perfectly in those spots.

It is made from Buna (nitrile rubber) – good strong material that handles oil well and does not break down fast from heat or normal use. The size is 7.65 mm across the inside and 1.78 mm thick. It squeezes into a groove, gets pressed when parts bolt together, and stops oil from leaking or air from sneaking in.