Honeywell Valve,Zone, 2 Way Normally Open, 1/2′, 12′, Sweat, 24Vac,, 1/2″ sweat two-way normally open quick fit zone valve,hydronic control, 24v, spring return to open, brass body, stainless steel stem, brass seat,18″ leads, 20 pound maximum closeoff pressure, 3.5cv