SMC (6940090) 694 Series PVC NSF Check Valve ; 1/4"FNPT x 1/4"FNPT Buna Activated Alumina1459 This size is commonly used

This size is commonly used for whole-house applications

ensuring reliable brine draw and regeneration cycles

and the adjustable thermostat lets you dial in your preferred temperature below the 190°F maximum

and initiate a manual regeneration cycle to verify proper backwash flow

This dual-media design significantly extends filter life compared to carbon-only cartridges while addressing chlorine

SMC (6940090) 694 Series PVC NSF Check Valve ; 1/4"FNPT x 1/4"FNPT Buna Activated Alumina1459 This size is commonly usedThe SMC 6940090 is a 1 4" FNPT threaded PVC check valve from the 694 Series, NSF certified with a Buna N seal for reliable one way flow protection in residential and commercial water systems. This compact valve prevents backflow and protects pumps, filters, and RO membranes from reverse pressure damage. SPECIFICATIONS SMC 694 Series Check Valve Technical Details Model Number SMC 6940090 Series 694 Series Connection Type 1 4" FNPT x 1 4" FNPT Body