We use 'whale' one way check valves on the transome drains. They are costly but they work well. Inch and a half hose size. You want to mount the cockpit drains as low as possible. Keep in mind with a couple of people in the cockpit the stern will squat so you want to locate the transome drains just above the waterline with a couple of people in the boat. The one way check valves we install keep out following sea's and a bonus is that the fuel tank locker is completely dry at all times. Fair winds Bob ron and cathryn goodspeed wrote:
Hello Dik, Well I blew it on the distance from the cockpit to the transom, when we got to the boat today I went "whoops!" because it measured 11.5 inches on "hula pie", outside to outside, and maybe some 1.5 inch thruhulls will work after all. Would a following sea wash thru? Maybe you would be so wet at that point it wouldn't matter.
Ron
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