Piggyback sack venting issues...

[theskunk]

2006 SV-211... Adding a sack on top of the hard-tank for surfing.

Also added one to the ski locker - no issues there.

I've seen a few other posts about putting a small tube in the sack to prevent a vacuum from forming and preventing things from draining properly. I'm considering doing this, but I'm also considering putting the sack on a T, and then letting gravity do the work of draining it, putting no vent directly on the bag itself. I figure if I have a small issue with gravity "running out of steam", If it's draining at the back, then theoretically just plowing water with the nose high will keep it draining, OR I can just reach over and put my hand on the vent on the side of the boat and force it to squeeze the sack a bit.

Thanks!

[d_nodixon]

You can also put in a t check valve between the bag and tank so that it opens and allows air in when the vacuum begins

[theskunk]

Now that would work... Let me draw a picture and get a consensus from the masses....

[theskunk]

This look about right?





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[theskunk]

This is the other option I've been considering



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[faralta]

Here's my diagram, http://www.planetnautique.com/vb5/fi...4&d=1422279896, from this thread, http://www.planetnautique.com/vb5/fo...-2004-san210te