Water two separate irrigation zones or plants with different watering needs using the 3/4 in. Flow Control Valve. Also known as an inline valve, it can adjust, balance, or shut off water to either circuit with a twist of the dial. The device accommodates two sections of 3/4 in. supply tubing (0.940 in. OD); simply insert tubing into the compression ring on each side for a watertight fit. Made of ABS plastic treated with UV inhibitors to prevent cracking.