Bags not draining all the way

[BCRider]

Good idea on the heat shrink around the hose clamps. That's a good idea. May have to go back and do that.

[Germaine Marine]

I cross vented my rear bags on my 2016 Z3 this helped tremendously I still get a little bit of drainage but nothing like before...I think I can reroute the hoses a little bit more to help eliminate it even more.

It's he drain that's really bad, if you check valve the vents that will accomplish the same
Thing. The drains on the other hand will have too much steady pressure against the flapper for it to work.