MPV Series Plastic Diaphragm Check Valves are Manufactured by Pneuline Supply. One-way valves are used for Ozone, pools, spas, printing, ink jet applications. Wound therapy, air mattresses, printing, ink jet applications, Vacuum applications, corrosive liquids. We are the exclusive producers of PVDF: Kynar 720® Valves with FFKM, Kalrez® 4079 Diaphragms.