So i am going to switch my front sac with one of my back sacks as the back sacs have a fill/drain ports on 1 end and another fitting on top. I plan on running a hose off the top front of the sac to a thru hull fitting. this should allow for venting/burping the sac and also it should flow when the sac is full.

ANy issues with that thought process? as long as the thru hull is above the line of the sac, it should not freely drain, correct?