O-ring, 38 x 3.0mm – Viton, Part# 4070621 – vacstellar

Description

This O-ring has an inside diameter of 38 mm and a thickness of 3.0 mm. That is the perfect size for several Pfeiffer pump models. It fits snugly in its groove. When you tighten the parts together, it compresses just enough to create a leak-proof seal.This O-ring is also included in the complete seal kits for these pumps . If you are doing a full rebuild on a DUO35 or UNO65, you will find this part in the kit.