Spacer, DUO 255M, Pfeiffer, DUO, Part# 440056

This is a vacstellar-made spacer. Its part number is 440056. A spacer is a simple but critical component. Think of it like a precisely cut ring or block. You place it between two other parts inside the pump.

Its job is to create the exact amount of space needed between those parts. It ensures that everything sits at the correct distance from everything else. Without the right spacer, parts can rub together, become misaligned, or fail to work properly .

This spacer is made specifically for one pump model:

• Pfeiffer DUO 255M (Index C) 

The DUO 255M is a special version of the DUO 255. It uses a magnetic coupling instead of a traditional shaft seal . This design avoids oil leaks at the shaft. If you own this pump and are doing any internal repair or rebuild, you may need this spacer.