The Taco 5121 Mixing Valve is a compact, lead-free domestic water thermostatic valve designed to deliver stable, mixed water temperatures for faucets or any point-of-use installation wherever an ASSE 1070 safety valve is required. The 3/8-inch valve is an addition to the existing 5120 Series mixing valve product line, which also includes 1/2, 3/4 and one-inch sizes. There are two versions – one with a T and elbow, and one without. Maximum flow is 5.8 GPM. Hot supply temperature range is 120-180˚F, cold supply range is 39-85°F, and the outlet temperature range – set at the factory for 110˚F – is 95-118˚F.