If you have a 3/8 X 24 UNF female port and need to connect a 1/8 X 27 NPT male pipe fitting this thread adapter will do the job. Male side is 3/8 x 24 UNF at 11.0mm long. The female side is 1/8 x 27 NPT at 10mm depth. Male side will fit a drill point/bubble or inverted/45 degree flare seat.