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✅ G Thread is Parallel (straight) threads (BSPP - British Standard Pipe Parallel), which have a constant diameter. The NPT thread is slightly tapered, while the G connection is straight. G Thread male pipe fitting to NPT female pipe fitting adapter. British BSPP (G) male to NPT female pipe fitting converter (brass). “G thread male” means the male part of the adapter is G thread. This lead-free brass adapter converts a G Thread (British BSPP) connector to an NPT connection. Built from heavy-duty brass for secure, leak-proof performance. Easy to install for both homeowners and contractors. Maximum Working Pressure up to 230 psi with temperature ranging from -65°F to +250°F (-53°C to +121°C)