Security advice: if the green cylinder will be visible in the coupled up condition, you know that the coupling has been put on the tow bar of your towing vehicle correctly. Wear indicator: an additional indication at the coupling grip shows you if the wear limit of the drawing vehicle's ball coupling is reached or not. The serielly softdock provides protection against scratching respectively shin protector. Technical data: gross vehicle weight 2700 kg. Bore: horiz/cross.Conn. AØ 30. W 50 mm.