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Also called: 1/2" NTP. National Pipe Thread Tapered Thread. This type of pipe thread is tapered so that the fit tightens as the pipe is twisted in. Common residential NTP pipe use is for water and natural gas. Although galvanized (zinc-coated) pipe is still considered to be a safe transport material for drinking water, there are some potential health concerns because this type of pipe tends to corrode over years of use. Also called: 1/2" NTP. National Pipe Thread Tapered Thread. This type of pipe thread is tapered so that the fit tightens as the pipe is twisted in. Common residential NTP pipe use is for water and natural gas.