Ridgid 68967 Model SF-2500 115 Volt Pipe Freezing Kit 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 1/2" Copper tube and can be used With up to 2 1/2" tube or 2" pipe. Once the pipe is pluggedrepairs can be made while the ice plug is Maintained by the unit. Now includes a bottle of Specially formulated freeze gel to speed freezing. Apply the gel to freeze heads before placing on pipe.