Valve, Zone, 2 Way Normally Closed, 1/2', 12', Flare, 24Vac,, 1/2" inverted flare two-way normally closed zone valve, 24v, spring return to close, brass body, stainless steel stem, brass seat,18" leads, manual opener, 20 pound maximum closeoff pressure, normally open spst auxiliary switch, 3.5cv