The SuperFreeze Pipe Freezer is an easy-to-use pipe freezing unit that allows the contractor to keep water systems operating while making repairs. The RIDGID SF-2500 is a mini-refrigeration unit that circulates self-contained refrigerant to its aluminum freeze heads. This forms an ice plug in as little as 5 minutes in copper tube up to 21/2" or steel pipe up to 2". Once the pipe is plugged, repairs can be made with no fear of the ice plug melting because the unit remains on!