What Jerry said.
NPSF = National Pipe Size Female (more commonly indicated as NPTF for National PIpe Thread Female).
Adapters are easy to find at nearly any FLAPS or Hardware store.
Another sealer would be "Gasoilia" made specifically for fuel and gasoline. Pipe threads will seal without a sealer, but you have to tighten them till your eyes bug out or the female fitting cracks. Without a sealer, you also run the risk of galling the threads. Bottom line is use a sealer (not JB Weld).
