Parker 8-4 RA-B Brass Pipe Fitting, Reducing Adapter, 1/2" NPT Female X 1/4" NPT Male Reducing adapter for connecting and extending pipes of different sizes Female National Pipe Taper (NPT) threads on one end and male NPT threads on the other for connecting different types of pipe Made from brass for higher corrosion resistance than steel NPT threads for creating tighter seals than straight threads More economical than steel