Three are pipe threads (NPT/NPTF, BSPT, BSPP) and three are not (UN/UNF, metric parallel, metric tapered). Regardless of thread type, there are a few relatively simple steps engineers, designers ...

You'll want teflon tape as both NPT and BSPT are tapered connections and the threads themselves are the sealing component (as opposed to a compression type fitting). Does your espresso machine ...