Hammer Unions are suitable for standard and sour environment, ranging in size from 1″to 8″ with cold working pressures from 1,000 psi to 15,000 psi . All unions have their own color signs for quick identification. The materials meet ASTM and AISI standards. Hammer Unions are available for Thread, Butt Weld and Socket Weld. All Hammer Unions are interchangeable with most other leading union manufactures.