These couplings are extensively used for the Fire Protection Industry on fire sprinkler and hydrant systems installed on commercial buildings and in factories, warehouses and other areas where water outlets are required.
Used for hot and potable water transfer but not hydrocarbons such as petroleum, kerosene and diesel.
The tongue and recess design of the mating surfaces adjusts to allow for the tolerance variations on standard pipe and positively clamps the pipe to resist structural and torsional loads.