i had this recently the pipe comes off inside the rear hatch panel simple to press back on but it could cause another problem like it did for me. The boot lock mechanism and switch got soaked as the pipe was splashing water everywhere, this made the alarm go off all the tine because the plug on the switch was soaked the alarm system thought the boot was being opened due to a dodgy connection. Get the panel off get the pipe back on and allow to dry out. I think my pie came off because the jets were so the pressure built up and blew the pipe off. Hope this helps.