This SF-2500 SuperFreeze (68967) from Ridgid is efficient, cost effective and easy to use. It helps avoid the cost and inconvenience of a system shutdown by allowing you to keep water systems operating while making repairs. It forms an ice plug in as little as 5 minutes in copper tube up to 2-1/2" and steel pipe up to 2". Once the ice is plugged, repairs can be made with no worry of the ice plug melting because the unit remains on.