WECO Check Valve 3/8" x 3/8" Tube Quick Connect
- Replacement check valve for larger reverse osmosis (RO) water filter systems.
- 3/8" push connect fittings.
- Quick and easy installation.
Check Valve is an essential part of a Reverse Osmosis Drinking Water Filter. Check valve allows water flow only in one direction. It is used to isolate the membrane from back pressure from the storage tank and to provide a solid barricade for the shutoff valve to push against.