QMG Variable Size: 28mm

A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

A compression coupling is a unique type of fitting used to connect tubing. These fittings are used in liquid and gas applications. Compression couplings are found in water faucet connections. Compression couplings are manufactured from various materials, including brass, copper, plastic and cast iron.

A compression coupling is a unique type of fitting used to connect tubing. These fittings are used in liquid and gas applications. Compression couplings are found in water faucet connections. Compression couplings are manufactured from various materials, including brass, copper, plastic and cast iron.

. An effective way of providing a water tight seal. An effective way of providing a water tight seal. Used in compression fittings, no need for flame or solder. The 4Trade brand represents trade quality and value for money. Quality product.