why would you remove the tray?
you drill 2 holes, one at the rear, and one in the engine back, then your take a piece of PVC and cut some teeth, use it to work the PVC from the rear hole to the front hole, then replace the tube, and seal the PVC to the hull.
Thats why you mount it on the firewall side. No leaky, no blow out.If you use a one way valve there is the possibility of it blowing out when landing off of a jump .
And about the 24-7 install that is the easiest place to drill the hole on the inside but it won't remove any water until it gets 2 inches high. Place it flat on the bottom of the hull.
I leave my ski in sometimes overnight:bigeyes2: so I dont want something that will leak... I think im gonna do the one-way