Description:1.This coupling is made of brass and connects two hoses with the different diameter in a straight run.2.This coupling has barbed connections on both ends for connecting two hoses.3.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).4.This fitting is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability.5.Hose fittings connect, control, change the direction of, and terminate the flow in piping and hose systems.6.Commonly used to connect lines for air, water, fuel, oil and inert gases in a quick and simple way.