I have a gravity games bag in my center locker and want to piggyback off of the drain side to just fill the nose bag. And then run a drain off of the nose bag to the thru hull.

I know this has been done on here but I am wondering where the "check valve" is supposed to go, (for venting I think)??

and does anyone have any pics of how they routed the tubing from the center locker to under the front seats??

Thanks

ps I have an 06 outback V