Mazzei (C75-CVA) 1.25" Check Valve for 2" Injectors PVC (1.25" FNPT x 1" Hose Barb Connections)Mazzei Injector Components Mazzei C75 CVA Check Valve for 2" Injectors Low cracking pressure PVC check valve engineered for chemical and air injection systems 1. 25" FNPT Inlet 1" Hose Barb Outlet PVC Construction Liquid & Gas Ready The Mazzei C75 CVA check valve prevents backflow in suction side applications where chemical or air injectors draw liquid or gas into the water stream. Its low cracking pressure ensures reliable operation even in low flow