Ridgid 68962 Model SF-2500 230 Volt Pipe Freezing Kit for up to 2" steel or 2 1/2" copper. The SF-2500 Pipe Freezer is an easy-to-use pipe freezing unit that allows the contractor to keep water systems operating while making repairs. 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 6 minutes in a 1/2" copper tube and can be used with up to 2 1/2" tubes or 2" pipes. Once the pipe is plugged, repairs can be made while the ice plug is maintained by the unit. Now includes a bottle of specially formulated freeze gel to speed up freezing. Apply the gel to freeze heads before placing on pipe.