You will need two of these
http://www.jmsonline.net/scupper-valve-1-1-2-ss.htm
On my boat I put two of these on the inside approx $10.00 each.
Then some flexible hose and 4 or 8 clamps.
FellowShip
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Just for the Grins
Official 23’ SF Antique Classic SeaCraft Owner