Hammer Seal unions have been utilized for years in oilfield piping systems. Mud fluid drilling systems that connect the steel tanks to the pumps need to have a leak proof and quickly detachable connection with a large diameter pipe size. Dynamic Flow manufacturers hammer seal unions from diameter sizes 6″ – 14″. The solid 0-ring locks down on the O.D. of the pipe as the hammer nut is tightened. All of the hammer seal unions are rated for 500 PSI. You can achieve a misaligned sealed connection with Dynamic Flow Hammer Seal Unions.