McDonnell & Miller Series TC-4 Test-N-Check® Valves

Test-N-Check® Valves ® . For hot water boilers. Simplifies ASME CSD-1A. code mandated testing of low water cut-offs by eliminating the need to drain the system. Includes one upper and one lower valve for mounting at crosses in equalizing lines. Restricts water flow when the low water cut-off’s blow down valve is open. Adjustable built-in vacuum breaker in upper valve provides rapid evacuation of water from the float chamber. 1″ NPT. Maximum temperature 250°F (121°C). Maximum pressure 160 psi (11 kg/cm2). Made in the USA.