When I order the metal or plastic tubes for my Bostitch compressor, do the compression fittings come with them? Wilson October 03, 2020 18:20 No, in order to receive the compression fittings, you must order the elbows and unloader valves that the tubes attach to. These components will have new compression fittings and compression nuts which are included. Related articles My compressor does not shut off; it continues to run and pump air and the safety relief valve leaks air very loudly. Comments 0 comments Please sign in to leave a comment.