Recently, my airbrush compressor seized so I ordered a replacement from http://www.tcpglobal.com. There were a few changes to the basic design. The one change I didn’t expect was that the output connection is now a 1/8″ BSP male not the 1/4″ NPT male of the previous unit. Well, I didn’t figure out the difference between a BSP and a NPT thread until after I tried to connect my trusty old Paasche airbrush. My first move was to order an adapter for the Paasche airbrush. US-made Paasche airbrushes use a NPT thread. The adapter didn’t fit the BSP hose very well or the airbrush. I did a little research and found that I should have paid attention to little connector detail. This time I did a Google and found that there is a difference and that adapter fittings are readily available from Amazon. Where else but Amazon? You can see the little fitting on the black knob. Well, I may be the last person on the plant earth to realize this difference.