Solder without draining the entire system! Change out a valve, solder or glue on fittings, make line repairs and test lines while under pressure with the Water-Gate. There's no need to shut off water to the rest of the building, drain lines, use bread clogs or freeze lines. Ideal for refrigeration and boiler applications, the Water-Gate's seals withstand temperatures from -20 to 225 deg F. The Water-Gate water shut-off tool works on copper, steel or PVC lines and is pressure rated to 65 psi.