3/4 x 1/2 Female Pipe Thread x Female National Pipe Straight Mechanical Swivel TeeThe 3 4 x 1 2 Female Pipe Thread x Female National Pipe Straight Mechanical Swivel Tee is a T shaped pipe fitting designed to connect three pipes at a 90 angle, with specific connection types for each side. Female Pipe Thread (FPT) on one side for connecting to a male threaded pipe and Female National Pipe Straight Mechanical (FNPSM) on the other two sides for connecting to male threaded pipes, which allows for a flexible and adjustable connection.