Zone Valve, 3/8" Flare, 24 Vac, Normally Closed, 15 Second Nominal Opening Time, 20 Psi Maximum Differential Pressure ( Closeoff ), 18" Leads, 3.5 Cv, Spring Return to Close, Normally Open SPST Auxiliary Switch, Manual Opener, Includes 2 Straight 3/4" Sweat Adapters