G.T. Water Products, Inc. TP122 Safe-T-Seal Test Plug, Fits 1-1/4-Inch to 2-Inch Pipes Professional drain line test plug Safe-T-Seal Safety valve Fits 1 1/4-Inch to 2-Inch pipes Non-slip rubber Used to test water lines in new construction and renovation projects A patented pressure release safety valve to help prevent over inflation or blow-out Made in the U.S.A.