SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT Autotrol (1030358) 8 GPM External Drain Flow Control replace Q5520 cartridge annually to

replace Q5520 cartridge annually to prevent bacterial growth and maintain filtration effectiveness

well water applications

Filter Protection

which uses a different piston design and port configuration

SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT Autotrol (1030358) 8 GPM External Drain Flow Control replace Q5520 cartridge annually toSMC Professional Grade SMC 685 Hastelloy Poly Check Valve 1 2" NPT Polypropylene inline check valve with Viton seals and Hastelloy springs for reliable backflow prevention in demanding water treatment applications Model 6850490 125 PSI WOG Chemical Resistant WHY IT WORKS Built for Corrosive Environments Hastelloy Spring Corrosion resistant Hastelloy spring maintains consistent closing force even in aggressive chemical environments where standard