Female Garden Hose End Plug / RV - Motorhome - Trailer Water Inlet Plug

I took the Hose to Bathroom sink adapter, and filled it in solid. I did it for my motorhome to plug the water inlet when not hooking up to water at an RV park, but I imagine it could be useful other places as well. There are two files, one has a wider head on it, otherwise the threads and overall height are the same.