Abstract: This invention is a mechanical coupling for lashing marine vehicles together or to a dock. The coupling includes male and female members secured respectively to different vehicles or to a dock and a vehicle, which members may be quickly and easily connected and disconnected as desired. The female member includes a vertical track of substantial length in which the male member is movably positioned, thereby permitting relative vertical movement of the male member in the female member in order to compensate for the rise and fall of the vehicle in the water.