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High pressure union is forged of high-strength alloy steel based on advanced international technologies. Strict heat treatment ensures that there is a uniform and consistent metallographic structure and pressure-bearing ability for joints. The materials are completely in conformity with U.S. ASTM and AISI Standard, the product technical index is completely in conformity with API Spec 6A Standard, and our union is well sealed, easy to load and unload, able to be used interchangeably. Joints of the product can be connected with pipe thread, tubing thread, and butt welding or non-pressure sealed end.