A double detector check valve is a double check assembly used in backflow prevention to protect potable water supplies from contamination. This particular type of backflow preventer used two check valves assembled in a series, and this is done for two reasons: one, if one check valve fails, another is still in place; and two,

The FEBCO 765 ¾ is a pressure vacuum breaker used to protect against the hazardous condition known as backflow, or back-siphonage.  It consists of an all-bronze body for durability, one check valve and an air-opening port, and all serviceable parts easily accessible for repair should repair be needed. FEBCO products are praised throughout the industry

A plumbing check valve is a device which allows liquid to flow through in only one direction.  One need not know anything about plumbing to understand the importance attached to fluids in your home only flowing in one direction. Fluids (mainly water) flows, normally, from the city’s potable water supply to your home by means