Griffco BPMP-Series diaphragm back pressure valves are designed to enhance the performance of chemical feed systems by applying a continuous back pressure to the chemical feed pump, while also acting as an anti-syphon valve. Robust construction ensures reliability in the rigorous service of municipal and industrial applications. Wetted materials include: 316 SS, A20, Hast. C, and Titanium. Available sizes: 1⁄4″ – 1″. Also known as medium pressure anti-siphon valves.