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