Product Type Reducer Nipple12Male NPT x 38Male NPT with protective casefor industry connecting pipes or fittings with different end typesdiametersor materialsNPT thread size does not actual diameterit is only nominal pipe size Product Material Forging of 304 stainless steel strength and resistance to corrosion Working Temperature Temperature range from 80 to 1472 degrees F62 to 800 degrees c Maximum Pressure Maximum working pressure is 2800PSI Special Feature The quality of forged stainless steel is better than casting