I have no vent line, I have to manually "burp" the sacs by loosening one of the plugs and letting the air escape and then tighten back down. This picture shows one sac turned on its side, I now point the two plugs up. These pictures were taken the first day I tried it out. I am able to fill the small brick using one of the hoses from the other sacs and then move it around. Also seen in this picture is my top of tower mounted navigation light, a DIY mod of the original nav light.
These are two of the drain pumps hidden next to the back seat, the seat is removed in this picture.
And this is all the hose you see in the boat, everything is on 1" quick disconnects, so they are easy to store away under the bow when not needed. Extra gas always works as ballast also!
Again, six aerator pumps, 4 switches (one for the valve), no new holes in the boat, everything, motor included is going through a 1.5" thru hull where the original 3/4" raw water pickup was. +/- 8 minute fill/ drain times. Been working great for more than two years now. Enjoy!