Hi there Scott,

I have just been using a plug of wood in the end of the tube for my float bags etc. Either a 1/4" dowel run in a pencil sharpener a bit or a slightly larger piece of wood so it's easier to grab and shaved to fit the tube.
No awards for beauty but they are very functional.
There was another thread on this a few months ago, you may want to do a search.

Ben Staley

: I am looking for purge valves. I am planning to make my own various size dry
: bags this winter. I would like to install purge valves in these homemade
: dry bags. The type of valve that I am interested in is listed at the
: options URL. Cascade Designs uses a purge valve in some of their dry bags.
: Seattle Sports also offers a AutoPurge (tm) valve in their dry bags.
: I am interested in the valves. I want to make many various size dry bags, for
: kayaking, bicycle touring, and backpacking.

: End.