NPT THREAD: ZOUNI hex bushing is an American standard NPT threaded interface. Apply for most American standard pipe thread connections. 304 STAINLESS STEEL: Our hex bushing made of high quality 304 stainless steel material, firmness, good performance, high toughness, strong corrosion resistance. SIZE: 1"Male NPT x 3/4"Female NPT Reducer Hex Bushing. Max. Pressure: 150 PSI ,Temperature range: -65 to 250 F. FUNCTION: Hex bushing is often used in the drainage pipeline industry. When the water pipe needs to be reduced in diameter, the reducer hex bushing will be used. In industrial life, it is often used to connect the internal and external threads of the pipe to change the diameter of the pipe size. WIDELY USE: Reducer hex bushing is widely used in large-scale power station supporting projects, seawater, steam, cold water, hot water, oxygen, drinking water, refrigeration, oil, gas, medical gas industries.