This union barb is made of 304 stainless steel and connects two hoses with same diameter in a straight run. This coupling has barbed connections on both ends for connecting two hoses. The barbed stems create a tight seal on flexible and semi-rigid hose when used with a hose clamp or crimp sleeve or ferrule (not included). This fitting is made of 304 stainless steel for corrosion resistance, ductility at high temperatures, and low magnetic permeability.