The tee has three openings for connecting 3 hoses of same or different size, they has barbed ends to create a tight seal on a hose when used with a hose clamp ( included). The t-fitting is made of brass for greater strength. They are used in patio, lawn garden hose connect, Irrigation, lawns, air compressors, automatic manufacturing operations, aircraft controls, and tire installation in industries including agriculture, mining, road construction, firefighting, and aviation