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heavy metals like lead and mercury
and check for leaks around the housing o-ring
Lubricate with food-grade silicone
Every 9 Months
SMC (6850490) 685 Hastelloy Poly Check Valve 1/2" NPT 20 inch x 4.5 inch Big Blue Filters2065 heavy metals like lead andSMC 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
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