Stefani 20mm 3/4" Female To Female Dual Check Valve For Hot And Cold Water

The Stefani 20mm Dual Check Valve is designed to prevent cross-contamination of non-potable water into safe drinking water. The two spring-loaded check valves remain tightly closed until there is a demand for water downstream. In the event that there is a reverse of flow direction, the check valves will close and back-flow is prevented. The Stefani 20mm Dual check valve provides protection in low hazard applications, like meter connections on domestic properties. Approved to AS 2845-1 Standards.