... , unions,They are widely used in fields of OIL field ,GAS processing,machinery manufacture, chemical industry, textile, food and papermaking. Type ... , Street Elbow 90°, Elbow 45°, Union, Type: Plug, Bushing, Nipple, Cap, Socket, and Coupling etc.Type: welding nipple, barrel nipplePressure Rating ... ISO7/1 etc. Size: 1/8" ~ 4" Round Headed Blanking Cap