This unique system, THE CLOZER + TC-3, can fill your suction line with non-toxic plumbing anti-freeze. This allows you to SHUT OFF your HEAT TRACE LINE while away from the cottage during the winter, saving you money on electrical bills. When you come back to the cottage, simply connect THE CLOZER with TC-3 to displace the antifreeze with potable water. Turn on your heat trace line, switch on the pump, and you are back in business