WIDE APPLICATION: The CST2 pipe freeze kit can freeze all types of liquids in steel, copper, cast iron and aluminum pipes ranging from 1/8" to 2" (10mm to 60mm) in diameter. FEATURES: The pipe freeze kit uses carbon dioxide (CO2) to freeze the pipe. The pipe freeze kit keeps full pressure system running while you perform repairs. It is faster and cheaper than electric refrigeration units and more efficient and more convenient than "bag" CO2 units. HIGH PERFORMANCE FREEZING KIT: The CST2 pipe freeze kit can quickly freezes all types of liquids in steel, copper, cast iron & aluminum pipes ranging from 1/8" to 2" (10mm to 60mm) in diameter, It requires just one 20lb Dip Tube CO2 Cylinder and starts freezing some pipe sizes in about one-three minutes. PACKAGE INCLUDED: The CST2 pipe freeze kit includes carrying case, safety goggles, hex head screwdriver, T-distributor locking nut and rubber gloves, 10 sets of freeze heads from 1/8" to 2" lines, 2 high-pressure spiral hoses with grips and injectors.