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It keeps a fully pressurized system operating while you make repairs. Freezes 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 CO2 cylinders are available from any welding supply house. The Cold-Shot works faster than refrigerator-type units is more compact and less expensive. It’s faster and uses less CO2 than bag-type pipe freezers because the freeze head makes a better seal around the pipe. In five minutes you’re ready to go to work on 1/2 copper tubing and just three minutes for cast iron pipe. The Cold-Shot is easy to use. Just place the freeze head around the pipe attach the hose and open the cylinder valve. Liquid carbon dioxide will flow into the freeze head and form dry ice with a temperature of minus 110F -79C. That’s cold enough to form an ice pack that can withstand 7000 PSI yet won’t damage pipes.