SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT 20 inch x 4.5 inch Big Blue Filters2700 then purge air through drain

then purge air through drain valve before bringing to full operating pressure

Light & Air Sealed

Chlorine will damage thin-film composite membranes within hours

Pre-Measured

5" (fits Big Blue housings) Filtration Rating 10 Micron Filter Media NSF 61 Certified Coconut Shell GreenCarbon PAC Flow Rate 3 GPM at 4

SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT 20 inch x 4.5 inch Big Blue Filters2700 then purge air through drainSMC 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