Caleffi, Milwaukee, Wisconsin, expands its plumbing portfolio with the 304 series Vacu-Stop vacuum relief valve. Available in 1/2-inch and 3/4-inch MNPT, the Vacu-Stop is suitable for use in water and low-pressure steam services.
It is ideal for use in water heaters and supply tanks. The valve automatically allows air into the piping system to prevent a vacuum, which can siphon water from the system and damage water heater/tank equipment. It meets the ANSI Z22.21 standard and is also NSF 61 and NSF 372 compliant.