A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water distribution systems,...

building codes mandate a series of measures and backflow prevention devices to prevent backflow. Backflow occurs for one of two reasons, either back pressure...

A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs...

A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is different...

hose spigots, hosebibbs, and wall hydrants to have a vacuum breaker or backflow preventer, so that water cannot return through the spigot from the hose...

regulations in many countries. An air gap is the simplest form of a backflow prevention device. A simple example is the vertical space between a wall-mounted...

external faucets (See the sample building code quote, below). Backflow prevention devices such as anti-siphon valves are required in such designs. The...

An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water...

A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply...

juice, or wine or for a fitting or tubing installed between a backflow prevention device and a carbonator." The FDA's Model Food Code specifically prohibits...