Cap for electric connector (car)

I made this quick & dirty cap to protect the electric connector that I have in the car boot to charge the battery.
Dunno the correct name of the connector, so I could not search for the cap and had to make it myself with Tinkercad.

If you print in Ninjaflex, the .stl is just fine. If you print in non-flexible material, add a milimeter to the dimensions, so it will easily slip on.