The Insta-Plumb release tool allows connections in the system to be easily removed and/or adjusted with no nuts, washers, or glue needed. It also allows the fittings to be reused for another application, if desired. The release tool fits 1-1/2-in O.D. size plastic drain pipes. Combine this item with other Insta-Plumb products to complete your under sink drainage project quickly, easily, and reliably.