I looked into it.
It appears to be for RV people who insist on having a small metal latch that can catch and stick and mess with you, just for the sake of messing with you.
Please know how in a marine situation a boat will move up down and side to side, perhaps many feet, at any time regardless of how you tie it to the dock. A latch, or my lazy butt actually using the lock ring on my already owned cord, will absolutely be needed on a BOAT.
RV...not so much.
That latch will mess with me every chance it gets.
That cord is just some work to replace your existing plug, and it might be two handed to release that latch.
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