Just a simple and plain plug for a cars 12 volt outlet which used to be call a cigarette lighter.

Two versions are provided. One is a friction fit that was made to fit an outlet that had the ID of 20.90mm.

The second is a bit smaller in diameter but has a groove that will accept a 2mm diameter o-ring for a tighter fit.

I've also provided CAD files so you can adjust the diameter of the friction fit design if needed.