SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna 20 inch x 4.5 inch Big Blue Filters2774 Fits Omnipure E-Series inline housings

Fits Omnipure E-Series inline housings

Standard 1/4" compression fitting connects directly to reverse osmosis tubing and water filter feed lines without adapters

The 1/2" female NPT threads match standard plumbing connections on equipment from brands like Pentair

The SUEZ AK4021TF (formerly GE Desal) is a commercial thin-film composite reverse osmosis element engineered for brackish and tap water applications where high rejection is needed at lower operating pressures

Q5467 8" x 2

SMC (6850090) 685 Series PVC NSF Check Valve ; 1/2” FNPT x 1/2" FNPT Buna 20 inch x 4.5 inch Big Blue Filters2774 Fits Omnipure E-Series inline housingsThe SMC 6850090 from the 685 Series is a PVC check valve rated for potable water systems, featuring 1 2" female NPT connections on both ends and a Buna N seal. This NSF certified component prevents backflow in residential and light commercial reverse osmosis systems, ensuring one way flow protection where you need it. SPECIFICATIONS SMC 685 Series Check Valve Technical Details Model Number SMC 6850090 Series 685 Series Body Material PVC (Polyvinyl