SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2"FNPT x 1/2"FNPT Buna - Pack of 3 GE Desal Residential RO Membranes Superior hardness rating resists breakdown

Superior hardness rating resists breakdown during backwashing

Replace if cracked

Replace 50 GPD membrane when TDS readings increase or water production slows significantly

while the weak base anion layer captures negatively charged contaminants except CO₂ and silica

Works with Most Standard 10" RODI Systems

SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2"FNPT x 1/2"FNPT Buna - Pack of 3 GE Desal Residential RO Membranes Superior hardness rating resists breakdownSMC 685 Series NSF Certified Check Valve SMC 6850090 PVC Check Valve 3 Pack NSF rated check valve for reliable backflow prevention in RO systems and water treatment applications NSF Certified PVC Construction 1 2" FNPT Threaded Connections Buna N Seal Material Pack of 3 The SMC 685 Series check valve prevents reverse flow in residential and light commercial water filtration systems. Built with NSF certified PVC body and Buna N seals, this valve