Multi-purpose Pipe Coupling. A multi-purpose pipe coupling is a pipe connection device with an axially pull-out resistant end on one side and no axial positioning on the other. It is designed to address the practical needs during pipe connection, including providing fixation while accommodating axial displacement of the piping system caused by large hull deflection, as well as accommodating thermal expansion and contraction of the piping system.Axial compensation about 100mm.