I couldn't figure out why my bilge pump wasn't working, so I took the hose off the pump and squirted water thru only to see a little green head pop out of the outlet fitting. I'm in Florida and there are a zillion mosquitoes where I live and thus a zillion frogs. I have googled all about to see if I could find an outlet fitting with a flap, to no avail. Thus this post. Any ideas?