Notice I didn't say lock since technically it doesn't lock. I found this searching the web and figured I would give it a try. The only other port security lock I saw that was available was the autocyb. It works well and isn't coming off unless someone breaks the connector prying it off, drills out the bolt, or uses the security wrench. It barely sticks down from the bottom of the dashboard. The screw looks to be a 1/4 20 thread so any style security screw should work if you prefer another style than what they provide. I have no affiliation with this company other than I am a satisfied customer. Certainly more secure than a red cover that says Do Not Flash.
BEM Auto makes unique car & truck accessories including the only locking diesel cap for the RAM capless diesel pickups: the EZ-Loc. All made in Kansas, USA.