3/4 in. x 1/2 in. Brass Sprinkler Extension (19.05 x 12.7 mm) is machined from a single piece of solid brass to extend the distance between a fire sprinkler's thread connection and sprinkler system piping. Used when a drop nipple has been cut too short or to accommodate variations in drop ceiling height, this extender features a 3/4 in. (19.05 mm) female NPT connection, a 3/4 in. (19.05 mm) male NPT connection, and is 1/2 in. (12.7 mm) long.