1/2" Supply connectors and ball valves

This fitting is typically used to connect an Under-the-counter Filter system to a 1/2" (15mm) water source. For example in most households, the supply connecter will be connected in between the angle valve and flexible hose that feeds cold water to the tap. The water will then still flow to the normal tap, while the 1/4" or 3/8" ball valve that "T-ing" out from the connector, will supply water to the filter system.