VW t25 t3 syncro viscous coupling. Fits in the front axle and often fails, there is plenty of information on Youtube on how to test a defective coupling. There is no scoring or distortion on any of the plates and as you can see from the photos, the coating on each plate is in perfect condition. I have cleaned the unit prior to photographing it and then reassembled using a new quadring. It just needs filling with the correct amount of silicone limited slip diff oil. I'm asking half the price of a new unit when they were available. I've guessed the postage at £20 it's quite heavy but overseas bidders please ask for a quote. I have a friend who could post it from Germany. Thanks for looking.