Deliver two varying water flows to two separate watering circuits, irrigation zones, or plants with different watering needs with the 1/2 in. Flow Control Valve. Compression rings on each side fit two lengths of 1/2 in. supply tubing (0.704 to 0.710 in. OD). Also known as an inline valve, the device features a ridged dial that adjusts, balances, or shuts off water to the two different areas. Made of ABS plastic treated with UV inhibitors to prevent cracking.