European compressor claw couplings are manufactured from iron and then zinc passivated for protection. These units have a universal lock head and are available with BSP female threads, BSPT male threads or a hose tail. They are supplied with a black rubber gasket and are used throughout the UK and Europe. American compressor claw couplings are manufactured from iron and then zinc passivated for protection. They look similar to the European type but have a different distance between the locking lugs. They also incorporate holes in the unit housing so 2 fittings can be locked together with a safety clip to prevent accidental disconnection. These fittings are widely used offshore and are sometimes referred to as ‘crows foot’ or ‘Chicago’ couplings.