So before you freak out that i cut up a part that is unobtainable, this one was bad. I've looked around before trying to find a dissected pic of one of these and never had much luck. So I thought I'd share.
So first pic is from the bottom looking up at where the ports come in at.
Second pic gives you a better orientation of the first pic.
The roundish foam pieces in the second pic sat in the bottom of the canister on top of the grate. this is what keep the charcoal inside.