API Type 10 High Pressure Swivel Elbow Threaded Union Swivel Elbow Product Description Swivel joint is cementing and fracturing equipment High Pressure Fluid Control Products. Hammer union is to change direction andto facilitate the construction of the pipeline connecting the pipe line connection.Widely used in the acidic operating environment (excluding containing CO2, H2S sour gas operating environment) in the high-pressure discharge line, input line, a temporary flow line,