Here is one I found and so far its working out it still lets some water in but not bad. Had to enlarge the holes and reseal in the back corners. If you want more details let me know. Ive got a 84 cuddy and the dranins are below water level. One thing i didnt do is double clamp the hoses might go back and do it. Pain in the *** to reach down in the hole and work.
http://shop.torresen.com/shipsstore/...PIT%20SCUPPERS