No need to drain water lines, sprinkler systems, or hot water systems before cutting pipe or tubing. The Cold-Shot keeps pressurized systems operating while you make repairs. It freezes all type of liquids in steel, copper, cast iron, aluminum, and plastic pipes ranging from 1/8" to 2" (10 mm - 60 mm) using carbon dioxide (CO2). Dip-tube type cylinders are available at all welding supply houses. The Cold-Shot is faster and less expensive than "refrigerator-type" units; faster and uses less CO2 than "bag-type" units. In five minutes you're ready to go to work on copper tubing, just three minutes for cast iron pipe. - 10 sets of freeze heads: 1/8" iron or 1/4" copper 1/4" iron or 3/8" copper 3/8" iron or 1/2" copper 1/2" iron or 3/4" copper 3/4" iron or 1" copper 1" iron or 1-1/4" copper 1-1/4" iron or 1-1/2" copper 1-1/2" iron 2" copper 2" ironFrom the ManufacturerNo need to drain water lines, sprinkler systems, or hot water systems before cutting pipe or tubing. The Cold-Shot keeps pressurized systems operating while you make repairs. It freezes all type of liquids in steel, copper, cast iron, aluminum, and plastic pipes ranging from 1/8" to 2" (10 mm - 60 mm) using carbon dioxide (CO2). Dip-tube type cylinders are available at all welding supply houses. The Cold-Shot is faster and less expensive than "refrigerator-type" units; faster and uses less CO2 than "bag-type" units. In five minutes you're ready to go to work on copper tubing, just three minutes for cast iron pipe. - 10 sets of freeze heads: 1/8" iron or 1/4" copper 1/4" iron or 3/8" copper 3/8" iron or 1/2" copper 1/2" iron or 3/4" copper 3/4" iron or 1" copper 1" iron or 1-1/4" copper 1-1/4" iron or 1-1/2" copper 1-1/2" iron 2" copper 2" iron