Tubing connections on this manifold are inverted (connections going upward) - 1 inch ball valves on inlet - 3/4 inch male outlets - 150 PSI maximum working pressure - 35 PSI maximum air vent discharge pressure - 32 degree to 180 degree working temperature range - 50 percent maximum glycol antifreeze solution - 2 inch outlet center distance - Includes 2 inch gauges - Distribution manifolds for radiant panel systems are used to optimally distribute the heating fluid in floor heating system circuits and ultimately improve the control of heat emission from the panels. The manifolds ensure that the flow to each circuit is regulated precisely and also control the shutoff, venting and automatic removal of air from the system