This is the PART NUMBER 1J6 827 505 B B41. The replacing is really simple - there are 2 torx screws one in each of the boot panel handle mouldings. Once they are removed is just a case of prizing the panel free, a little tricky, but simple. Once the panel is off there are 2 bolts holding the catch and the actuator to unhook. The washer pipe you can see quite easily and it will be obvious if it has been leaking. I tried just pushing it back on, but after a couple of weeks I had the same problem again. I ended up cutting the hard plastic water feed hose back about an inch down from where it had fitted to the wiper mechanism and put a piece of silicone pipe in its place, held with tie grips. This has definitely stopped the leak - but just waiting for my 2nd catch to arrive. Lesson learned in not trusting the water feed to hold, simply by pushing it back into its original place!