I always remember port anyway because it's the side boats dock in to the port, with the left hand side, and i have a photographic memory so i just picture the part in pirates of teh carribean where Elizabeth comes up behind Jack dressed as a pirate and she asks him if she can join the crew ... there is a boat behnd them docked with the bow of the ship to the left of the screen. Anyway, point made. So i put the in and out pipes both on the rear (transom/aft) of the boat? I'm not certain what you meant by where i need to put them.

It may be that i don't need them at all judging by the lower voltage battery I'm using.