[flybouy]

If you have a Flo-Jet use the fitting John posted with a length of tubing. If it's a different pump then but a "winterizing kit" the includes a hose, a valve T fitting and install it on the suction side of the pump.

The single valve is used on water heaters that have a check valve screwed into the WH hot water out pipe. The valve is only needed to divert cold water from going into the thank and diverting it to the hot water line. The valve handle indicates the direction of flow, so for water to enter the tank turn the handle to point towards the tank. To bypass the tank, turn the handle 1/4 turn until it points to the bypass pipe.