Hi all very new to this I’ve just brought a year 2000 fiat ducato Laika eco vip with temperatures dropping I really want to drain the tanks, but I can’t find out how to drain any of them! I have managed to download manual and it says drainage tap under seat, and it isn’t! I was going to drain via the taps but I’ve managed to break the switch for water on control panel so waiting for a spare, it’s all going Pete tong please help (with pics if poss)