182741 LK 556 Anti Freeze Valve 1 1/4 Inch Male

These LK 556 antifreeze valves are installed to the flow and return, and at the lowest part in the system outside. They will open before the water freezes. Ideal for protecting the heat pump and heat exchanger inside, and avoiding the use of glycol which reduces system efficiency slightly. 1 1/4 inch connections, and a matching insulation jacket is available.