Home built compressor. Yes another one.

[jdurand]

Plumbers tape doesn't work with BSP fittings, it's ONLY for American tapered fittings. The same goes for thread goo, it's only intended for tapered thread.

I understand that people outside the USA think the idea of tapered thread to be crazy talk. But hey, we're Americans so crazy fits right in.

Here's an example of an ACTUAL "multi-length" pipe fitting used in the USA.