Not for potable water - For 1-1/4 inch x 1 inch threaded system piping - For boilers with external circulators - Includes: 1 - hot and cold double boiler drain manifold, 1 - 1-1/4 inch female adapter with valve, 1 - fully fabricated and insulated flexible supply and return lines with 1 inch female fitting, 1 - rigid copper line, 1 - 30 PSI pressure gauge, 1 - 30 PSI pressure relief valve, and 1 - 3/4 inch female service valve kit with 150 PSI pressure relief valve