Pipes

You can put water through them, although I don't know why you would. Due to the chaotic hodgepodge of King's Laws and Kingdom Restrictions, you must have the required XP to be able to handle these powerfully majical items. To be under the XP limit will result in banishment from the Wizard's Tower for eternity and the ruining of enjoyment for everyone who comes after you that will no longer be able to enjoy the Wizard's awesome wares. Don't ruin it for everyone. Just be 21, please. It's not that hard. You don't want to be on the Wizard's bad side. He eats faeries for lunch, FAERIES FOR LUNCH! OK. Seriously though, don't be that guy/girl.