BSP threads can be parallel or taper, they are basically the same thread, Whitworth form, but the taper one has a 1/16 in one inch taper. I assume we are talking fittings used for compressed air. Other cheaper alternatives available for less demanding applications - try Tru-Loc range PTFE Tape was banned on railway air brake systems due to the fact that loose strands could easily block small orifices. It's the only none setting one I can find. Took heat, a lump hammer and 300mm wrench. I have undone one fitting that had been sealed this way. There are a number of different type of liquid ptfe pipe thread sealer about most are anaerobic and screwfix reviews suggest that once done up undoing is tricky - locked solid. The web suggests that BSP female switched to parallel at some point but still using a tapered male. The only pneumatics I have been near have all used push fit fittings so I wasn't sure about what to use to seal or if sealing is needed. Looking around on the web this seems to be a common problem and the tape can finish up blocking things. While I was fitting an adapter it came on and off a couple of times and I noticed small bits of ptfe tape had been torn off doing it up.
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