Silent running heat motor saves power via intermittent energizing;Unique double torsion spring opens and closes smoothly, prevents water hammering, assures positive shut-off;Leaf-type stack switch with blade terminals allow fast installation and no soldering;Compact design and ultr-quiet operantion is ideal for installation under baseboards of wherever space is limited;Available in 3/4” sweat body connections;Minimum working pressure 125 psig (862 kPA);Fluid temperture range 40 Degree F (4 Degree C) to 240 Degree F (115 Degree C)