O-ring, 165 x 3 mm – Viton, Part# 4071536

This is the Pfeiffer O-ring, Part# 4071536. It is a direct replacement part. You do not need to modify anything. Just take out the old ring and put this one in.

Exact Fit for Your Pfeiffer Pump
This is a large O-ring. It has an inside diameter of 165 mm. The thickness of the rubber ring is 3 mm .

Because it is made to Pfeiffer’s factory specs, it fits perfectly on these pump models:

• Pfeiffer DUO 5

• Pfeiffer DUO 5C

• Pfeiffer DUO 10

• Pfeiffer DUO 10C

  This O-ring is not made from ordinary rubber. It is made from Viton (also called FKM). This material is famous for being tough.

  Here is why Viton is the right choice for your vacuum pump:

  • Handles High Heat: Your pump gets hot when it runs. Viton stays soft and flexible even at high temperatures .

  • Fights Chemicals: It resists pump oils, fuels, and acids. It will not swell or crack.

  • Low Gas Flow: Viton is very good at stopping air and gas from passing through. This helps your pump reach a strong vacuum .

  • Long Life: It lasts much longer than standard rubber O-rings.