legines brass reducing coupling 1/2" npt female x 1/4" npt female, hex reducer coupler adapter pipe fitting 1200psi (pack of 2) legines legines brass reducing coupling is a brass pipe fitting with female national pipe taper (npt) threads on both ends for connecting male pipes. this reducing coupling has one end that is smaller than the other for connecting different sizes of pipe going in the same direction. it has npt threads for creating tighter seals than straight threads and is made of brass, which is comparable in strength to stainless steel and is also more corrosion resistant. <br><p> pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. when purchasing pipe fittings, consider the application, as this will affect material type, shape, size and required durability. fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).