... pipe fittingAmale and female with union,hot forged, fine thread, BSPP thread,ISO228 parellel thread or NPT thread, Size from 3/8, 1/2, 3 ... forge,Surface Treatment: nickle, chrome, brass natural, zinc, HDGConnection type: thread (BSP, NPT), weldingStandard: ISO, GB or ASTM, ANSICertification: ISO 9001 ...