For use on 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 connection
• Maximum temperature 250°F (121°C)
• Maximum pressure 160 psi (11 kg/cm²)