SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT 20 inch x 4.5 inch Big Blue Filters2065 5" or 20" cartridge positions

5" or 20" cartridge positions for high-volume commercial water treatment

or discoloration—these indicate imminent failure that could interrupt chemical dosing and compromise water quality

Every 9 Months

✓ Available in 1

SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT 20 inch x 4.5 inch Big Blue Filters2065 5" or 20" cartridge positionsSMC 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