This Steel Key (Part #220006) is a small but essential hardware component for your Pfeiffer DUO vacuum pump. It is 60 mm long and made from durable steel . The key fits into slots on a shaft and a rotating part. Its job is to connect them together. It transmits torque, or turning power, from one part to another. Without it, the rotating parts would slip. This key is designed specifically for the Pfeiffer DUO 255M (Index C) pump model .
This Special Steel Key (Part #220007) is a custom-designed hardware component for your Pfeiffer DUO vacuum pump. Unlike standard keys, this one is made for a specific application within the DUO 255M pump . The key fits into slots on a shaft and a rotating part. Its job is to connect them together. It transmits torque, or turning power, from one part to another. Without it, the rotating parts would slip. This key is designed specifically for the Pfeiffer DUO 255M (Index C) pump model and is a critical component in the rotating assembly
10 in stock
10 in stock
10 in stock
This Viton O-Ring (Part #23970129) is a versatile sealing component for many vacuum pumps. It measures 65 mm (inner diameter) x 5 mm (cross section). Made from Viton, a high-performance synthetic rubber, this O-ring creates a tight, reliable seal. It prevents leaks and keeps your vacuum pressure strong. This O-ring is compatible with Pfeiffer, Busch, and Leybold pump brands. It is used in many models including the Pfeiffer DUO 120A, DUO 125, DUO 250A, DUO 255M, and UNO 250A. If you are rebuilding your pump, this O-ring is a must-have part. In fact, it is included as a standard component in the Seal Kits for the DUO 120A (PSK024) and DUO 125 (PSK025)
This Viton O-ring (Part# PL23970129) measures 65 mm inside diameter with a 5 mm cross-section. Made from Viton (FKM) , it offers excellent resistance to high heat, chemicals, oils, and fuels. It is commonly used in repair kits for Busch, Leybold, and Pfeiffer vacuum pumps and is ideal for creating tight, reliable seals in harsh environments .
10 in stock
10 in stock
This is the Pfeiffer Part# 380049 Valve Plate. It is a replacement part used on Pfeiffer DUO250A and DUO255M (Index C) vacuum pumps . You will also find this valve plate included inside major overhaul kits for these pump models . Keep your pump’s valve system working right with this direct-fit part.
This small but important part is a Pfeiffer sealing ring, also known as a Dowty seal. The part number is 300216. It is made from tough FKM rubber and measures exactly 10.4 x 16 x 2 millimeters. If you have a Pfeiffer DUO 255M vacuum pump (Index C version), this seal helps stop leaks and keeps the pressure just right. Replace your old or worn seal with this one to keep your pump running strong.
10 in stock
This Valve Seat (Part #390028) is a specialized component for your Pfeiffer DUO vacuum pump . It works together with the valve spindle to create a tight seal. This seal controls the flow of gases through the pump. A worn or damaged valve seat can cause leaks and reduce vacuum performance. This valve seat is designed specifically for the Pfeiffer DUO 125 and DUO 255M (Index C) pump models . If you are rebuilding your pump or fixing a valve leak, this is the part you need.
10 in stock
10 in stock
10 in stock
For complete kit content details see bill of materials below
This is the Pfeiffer Part# PVK025 Vane Kit for DUO 250A and DUO 255M (Index C) vacuum pumps . This kit includes four vanes and four springs . It is also compatible with the DUO 120A pump . for optimal performance, this vane kit provides a reliable solution for routine maintenance (recommended every 4 years) and helps restore your pump’s original vacuum performance .
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