The WILKINS Double Check Valves are available at Smart Water Shop:
The Wilkins Double Check Valves are designed for installations on potable water lines, with the sole purpose of preventing backflow and cross contamination between water sources. When installed underground or indoors, Double Check Valves aid in sprinkler system winterisation, as they are not exposed to freezing temperatures and aren’t likely to suffer frost damage as a result. Double Check assemblies are less expensive than Reduced Pressure Zone assemblies; however, Double Check Valves are not approved as a backflow preventer for water systems containing hazardous substances or materials.
For more information about this product, contact the professionals at your closest Smart Water Shop.