Those of us who have their boat on a lift often have the same, but more difficult issue: the drain plug is not accessible from the dock. I was not comfortable risking my expensive boat with a flimsy or failure-prone plug.
I tried the quick oil drain plugs, which can be amenable to opening and closing from the dock, using a custom tool on a stick. The problem was these valve levers must
be lifted to open, and the ID is only 3/8” for the 1/2” valve.
I found a mueller
210-524HC locking gas valve that requires a “push” and twist to open, which is easily accomplished with a simple tool on a stick. The 3/4” valve has a large ID that can be reduced to 1/2” if needed.
This has worked well. The valve is very sturdy, and is not easily damaged even though it sticks out about 3” from the transom. If you forget to close the valve before the boat is in the water, it can still be closed by hand (you will get wet!)
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