This is the Pfeiffer Part# 390009 Valve Coupler Plate. It is a replacement part made from Stainless Steel and Viton . It is used on Pfeiffer DUO pump models, specifically the DUO2.5, UNO2.5A, and UNO5A . You will also find this plate included inside minor repair kits and motor coupling kits for these pumps . for a perfect fit, this component ensures optimal performance in your vacuum system.
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