CHECK VALVE QF-020-L 1/8'' MALE THREAD – 1/4'' TUBE WATERRO CHECK VALVE QF-020-L is a Quick Fit 90° check valve designed for reverse osmosis and water treatment systems. It connects a 1/8-inch male-thread connection to a 1/4-inch Quick Fit tube and allows water flow in only one direction. The check valve prevents backflow and helps protect membranes, pumps, pressure tanks and other system components. The Quick Fit connection enables fast, tool-free installation, while the 90° design facilitates installation in confined spaces. Technical specification Parameter Value Product Quick Fit 90° check valve Model QF-020-L Connection A 1/8" male thread Connection B 1/4" Quick Fit tube Valve type One-way check valve Configuration 90° angled connection Flow direction One direction Application Reverse osmosis & water treatment systems Key benefits Integrated one-way check valve 1/8" male-thread connection 1/4" Quick Fit tube connection 90° angled design Prevents water backflow Protects RO membranes and system components Fast Push-Fit installation Leak-tight connection Reusable No special tools required