Key, Steel, Special, Pfeiffer, DUO, Part# 220007

This is a small, specially shaped piece of steel. Its part number is 220007. It is called a “special” key because it is custom-designed for a specific application in the DUO 255M pump. It is not a standard off-the-shelf key .

Think of it like a small block that fits into special grooves. One groove is on a rotating shaft. Another groove is on a wheel, gear, or other part that needs to spin with that shaft. You place the key in between, and it locks the two parts together.

This special steel key is made specifically for one pump model:

• Pfeiffer DUO 255M (Index C)

If you own this pump and are doing any repair work that involves the rotating assembly, you may need this key. You will also find this key included as a component in the Major Overhaul Kit (Part # PMK028) for the DUO 255M .