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For the drain outlet hose I use a 1 1/8 thru plug forn west marine Home depot sells a pump hose to fit, and to block off the outlet use a tub/sink screen drain and secure with 3 stainless screw with a stainless nut for a spacer between screen and outlet, abut 3/16 thick nut shoud do.
The less water on my yack the better..
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