V6 Style 3/4" X 1/2" 4-Way Heat Pump Reversing Valve, Material:Brass,Stainless, Copper, Connection Size:3/4" (3) X 1/2", Solenoid Valve:No, When Installed In A Heat Pump System, Reverses The Direction Of Refrigerant Flow Through The Heat Exchanger Coils To Provide Heating Or Cooling From The System And To Provide For Defrosting Of The Outdoor Coil In Air Source Units. It Is Designed For Residential And Commercial Heat Pumps (Unitary And Split Systems), Including Air And Water Heat Sources, Weight:1Lb, Origin:China, In Box.