Ring Supporting-Pfeiffer DUO, Part# 520036 – vacstellar

Description

This is a supporting ring designed for Pfeiffer DUO 250A, DUO 255M, and UNO 250A series vacuum pumps. It is an internal component that helps position and support other parts within the pump, ensuring stable and efficient operation during heavy-duty use 

You will often find this supporting ring included in major overhaul kits. For example, it is part of the PMK026 Overhaul Kit for the UNO 250A pump . That means it is a standard part that gets replaced during a full pump rebuild, typically every 2 to 4 years depending on usage