On Thu, 29 Oct 2009 10:19:42 -0700, "Capt. JG"
wrote:

I've not
had it happen yet, but I could imagine a plastic bag getting trapped on that
screen. The only two ways to remove it would be to either stop the engine
and hope the plastic fell away or visit it personally.

Put a tire valve on the thru hull. Carry a tank and a small, cheap 12V
air compressor, things nice to have for any trailer rig. If you have a
boat too big to trailer, you can tap off the air for the horn.

Casady