1/4" Male Inverted Flare Plug.
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The item I received wasn't exactly like the picture posted. Mine had another tiny plug in the flat end of the plug. The plug works but I am concerned about the tiny plug coming out at some time in the future.
RV folks often install "stay awhile kits". These kits include this product. It's very easy to lose. I ordered a bunch for me and my buddies.