Push-Fit Non-return Valve Straight 12mm Stem (M)12mm (F)

A valve is a device that regulates directs or controls the flow of a fluid by opening closing or partially obstructing the passageway. A non-return valve is fitted to ensure that a medium flows through a pipe in the right direction where pressure conditions may otherwise cause reversed flow. The Whale Quick Connect Non-return Valve 12mm stops fluids from damaging your pump by regulating the flow of the water. This extends your pumps life span and saves you the hassle of having to replace the whole pump. It can also be used to seperate hot and cold water and for any other application where you want the water to only flow in one direction.