This Orbit 37164D swing-joint elbow pipe fitting is made to install garden sprinkler heads to in ground sprinkler pipes. This sprinkler pipe fitting has a 3/4-inch MNPT (Male National Pipe Thread) connection and a 3/4-inch FNPT (Female National Pipe Thread) connection for many different pipe fitting uses. This Orbit 37164 sprinkler part attaches to poly pipes and PVC irrigation pipes to create swing joints for attachment to yard sprinkler system heads. This is an ideal piece of sprinkler system equipment for sprinkler systems repair and sprinkler head installation. Features and Benefits: Attaches lawn sprinkler heads to underground sprinkler system pipes, Has a 3/4-inch male-threaded inlet and a 3/4-inch female-threaded inlet, Use with PVC sprinkler pipes and poly pipes, Durable construction guarantees years of dependability.