SMC (6460090) 646 Series Brass Check Valve ; 3/8" FNPT x 3/8" MNPT Hanna (HI70032P) 1382 PPM @ 25C TDS Calibration Solution but the LED will continue

but the LED will continue flashing as a reminder

Point-of-Use Protection

Blue & White F-451 series has been the industry standard for water treatment flow monitoring since 1988

High-Volume Use

SMC (6460090) 646 Series Brass Check Valve ; 3/8" FNPT x 3/8" MNPT Hanna (HI70032P) 1382 PPM @ 25C TDS Calibration Solution but the LED will continueSMC 646 Series Brass Check Valve 3 8" FNPT x 3 8" MNPT Prevents backflow in residential and commercial water treatment systems with reliable spring loaded brass construction Model 6460090 3 8" NPT Connections Lead Free Brass WHY IT WORKS One Way Flow Protection Spring Loaded Mechanism Internal spring ensures positive closure and prevents reverse flow even under variable pressure conditions Brass Body Construction Lead free brass housing resists