The Cold-Shot Pipe Freezing Kit from General Pipe Cleaners lets a plumber repair an operating water system without draining waterlines, sprinkler systems or hot water systems before cutting pipe or tubing. Using CO2 in dip-tube cylinders, it freezes liquids in steel, copper, cast iron, aluminum or plastic pipes, 1/8 through 2 inches in diameter. Simply place the freeze head around the pipe, attach the hose and open the CO2 cylinder valve. Liquid CO2 flows into the freeze head, forming an ice pack in the pipe capable of withstanding 7,000 psi. It can create an ice plug in copper tubing within five minutes, and in steel pipe within three minutes, providing a seal and distributing CO2 evenly around the pipe. The kit includes 10 sets of freeze heads, two high-pressure spiral hoses with injectors, rubber gloves, goggles and carrying case. 800/245-6200; www.drainbrain.com.