The 90-degree elbow is used for connecting a hose to a hose threaded at a 90 degree angle, this fitting has barbed ends to create a tight seal on a hose when used with a hose clamp or crimp sleeve or ferrule (included).It is made of brass for greater strength.They are used in patio, lawn garden hose connect, air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation.