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Thanks for the reply and thorough explanation, Capt Len.
I want to add a couple 2" or 3" cockpit drains with hoses from the aft end of the foot well to new through-hulls in the canoe stern just aft and below them. The existing arrangement of 2 standard 1 1/4" drains seems inadequate. My search for externally-mounted flapper valves started there. I figure that if one fails somehow, I'll get wet feet but the boat won't sink.
I then thought to add a flapper to the exhaust while I was at it, since I have nothing there now but a high loop. A bronze fitting for the exhaust would be ideal, but will have to wait for the budget to catch up. A seacock is another thing I've considered.
Last edited by Faster; 12-04-2011 at 09:09 PM.