O-ring, 15 x 5 mm – Viton, Part# 4070262

This is the Pfeiffer O-ring, Part# 4070262. It is made to fit specific pump models perfectly. It restores the seal and stops air from leaking in.

Exact Fit for Your Pfeiffer Pump
You don’t want to guess with rubber parts. If the size is wrong, the pump won’t work right. This O-ring is built to the exact factory size: 15 mm inside diameter (ID) with a thickness (cross section) of 5 mm .

Because it is a genuine part for the Pfeiffer family, it fits the following pump models without any trouble:

• Pfeiffer UNO 1.5A

• Pfeiffer DUO 1.5A 

  This O-ring is made from Viton (also known as FKM). We chose Viton for a reason. It is much tougher than standard rubber.

  Here is why Viton works best for vacuum pumps:

  • Handles High Heat: Your pump can get hot during long runs. Viton stays strong even when the temperature goes up.

  • Fights Chemicals: It resists oils, fuels, and acids. It won’t swell up or break down when it touches pump oils.

  • Low Gas Flow: Viton is great at stopping gases from passing through. This helps you reach a deep vacuum level .

  • Temperature Range: It works reliably in cold and hot conditions (roughly -15°F to 400°F)