Xylem TC-4 Test-N-Check Blow Down Valve for Hot Water Boilers

The Xylem TC-4 (McDonnell & Miller part number 195000) is a Test-N-Check hot water boiler blow down valve designed to simplify ASME CSD-1 code-mandated testing of low water cut-offs without the need to drain the entire system. This dual-valve assembly streamlines maintenance procedures and ensures compliance with safety regulations for residential and commercial boiler installations.

Key Features:

• Includes one upper and one lower valve for comprehensive testing capability
• 1" FIP (Female Iron Pipe) threaded connections for mounting at crosses in equalizing lines
• Adjustable built-in vacuum breaker in upper valve provides rapid evacuation of water from the float chamber
• Restricts water flow when the low water cut-off's blow down valve is open
• Maximum working pressure: 160 PSI
• Maximum temperature rating: 250°F
• Eliminates the time-consuming process of draining the boiler system during safety testing

The TC-4 valve assembly is engineered for both professional HVAC technicians and facility maintenance personnel who need to perform routine low water cut-off testing efficiently. By eliminating system drainage requirements, this valve significantly reduces testing time while maintaining full compliance with ASME safety codes. Suitable for use with most residential and commercial hot water boiler systems.