Metal Expansion Joints also known as compensators are flexible connections, installed in piping and ducting systems to accommodate expansion and vibration caused by changes in temperature, pressure and/or media. Metal bellow are made of one or multiple plies in carbon steel, alloy steel, stainless steel, nickel alloy, copper, aluminium or other formable materials. Metal expansion joints can be designed with hardware, intended to retain system pressure thrust load, while allowing intended design movement.