SharkBite U702 Safe Seal Tool. This is the SharkBite Safe Seal Tool and is used for deburring and setting the depth on CPVC, copper and PEX tubing. The SharkBite Safe Seal Tool has three sizes on it 1/2 in , 3/4 in and 1 in . After pipe has been cut insert into correct size and deburr by rotating. Before removing mark tube at the end of the SharkBite Safe Seal Tool, this is the depth the tube must go into the SharkBite fitting for proper connection.