Valve Exhaust, 120A, 250A, 255M, Pfeiffer, DUO, UNO, Part# 580053 – vacstellar

Description

This is a exhaust valve designed for Pfeiffer DUO 120A, DUO 250A, DUO 255M, and UNO 250A vacuum pumps. It controls the release of exhaust gases, ensuring proper pressure regulation and quiet, efficient operation .

This valve is used in several popular Pfeiffer models. It fits the DUO 120A, DUO 250A, DUO 255M (Index C), and UNO 250A pumps . These are industrial‑grade pumps that run in demanding environments.

You will often find this exhaust valve included in major overhaul kits. For example, it is part of the PMK024 Overhaul Kit for the DUO 120A pump and the PMK026 Overhaul Kit for the UNO 250A pump . That means it is a standard replacement part during a full pump rebuild.