Water Treatment ComponentsCheck ValveContact Us to PurchaseFeatures Install in the pure water outlet of RO housing, to prevent RO membrane from back flowing and wasting water. Quick connector, easy maintenance. Specification Model Type Spec Remark VA-0164 quick connector, elbow style, white 1/8 NPT x 1/4 OD plastics VA-0165-1 ball valve, blue bat 1/8 NPT x 1/4 OD plastics ApplicationSuitable for RO pure water system