The Laundry-Mate control valve has a unique triple-seal packing and features self-adjusting, spring-loaded, non- wearing action. By eliminating constant water pressure shock, Laundry-Mate extends the life of your washing machine hoses. Laundry-Mate installs easily between 2 x 4 in studs on 16 in centers with angle mounting straps (furnished). Copper tubing supplies enter the sides of the unit from above or below and attach to union elbows. Just connect the valve to the union elbows with two screws, install the drain pipe and hoses and screw on the cover - your work is done. Symmons® No Lead Washing Machine Valve, Automatic, Series: Laundry-Mate®, 1/2 in Nominal, C, 100 psi, 250 deg F, Brass Body, 4.78 in L x 4.75 in W x 1.9 in H