Patent 6,769,291;Tip acts as a handle while applying glue and can be snipped to allow filling and bleeding with water or air for testing;Deeper glue surface ensures a good seal, especially on unevenly cut pipe;Durable, ABS may be glued to pipe with all-purpose glue;High-visibility models make installed plugs and caps easy to see for ensured removal;Test nipple is 5/8" O.D. for connection to compression fittings