To install hot water Circulator
Remove the shutoffs under your sink after turning off the main water supply. Be sure to open the water valve outside to relieve the pressure in plumbing lines. The shutoffs shown here are attached with compression fittings that you can remove with an adjustable wrench. If your shutoffs are soldered on, remove them with a mini tubing cutter or a hacksaw, cutting as close to the shutoff as possible.
Install the copper that comes with the pump unit onto the hot and cold water lines. Mount the hot and cold shutoffs on the unthreaded end of the copper tees, using the compression ring and compression nut that comes with the tees. Drill a hole in a convenient location in the cabinet near the sink and mount the push-button activator that's supplied with the pump unit. Connect the remote receiver unit to the remote wire on the pump.