This corrosion-resistant PEEK valve body and stainless piston is the mechanical component of the Buffer supply valve as of November 2022. It is used as a replacement component for the Water, Buffer, EtOH78, and EtOH95 supply valves. It includes the Valve Seat (Part #: Z132), Valve Spring (Part #: Z135), and Viton O-ring (Part #: Z133). This is replaced if corrosion has caused pitting or imperfections in the sealing surface within the brass valve, and does not require rewiring of the solenoid valve.