Plumbing method and composition for use in same

A method of applying a sleeve-like connection between the spaced open ends of a cut pipe, said method comprising inserting into at least one of the open ends of the pipe a plug of plastic material formed of a mixture of a water soluble alginate and bentonite and of a size and shape to conform to the interior size and shape of the pipe to form a watertight seal, such plug having the property of sealing the pipe but of disintegrating readily upon flow of water in the pipe, then applying such a sleeve-like connection between the ends of the pipe by fitting it over the end portions of the pipe, sealing the resulting joints and thereafter causing flow of water in the pipe to disintegrate the plug or plugs and flush the same out of the pipe.