Quote Originally Posted by KINGCOBRA View Post
It took me a minute(or 5) to digest what fman did. Just to be straight, I'm going to attach hose to 3rd fitting on bag (the one that is currently plugged) and run that up to a Y-fitting to which I also connect the drain hose form bag and after the Y-fitting attach the check valve and then connect that to the thru hull fitting. Is that right? Thanks
You got it! I had a pic but it got lost in the upgrade. I'll see if I have it saved on my computer tonight.

Here is the check valve: http://www.wakemakers.com/marine-check-valve.html
and the wye fitting: http://www.wakemakers.com/hose-barb-wye.html