On a related note..............
For those of us who intend to carry their Ravelco plug on their key ring, but want it easily detachable so their fob and other keys aren't dangling from it (and thus stressing the connection over time and/or banging into your dash and leg), I did some research and found this:
Everything for your keys. Keep your keys safe, organized or just stylish. Shop and Buy Key Rings Online - No Minimum Order - Huge Selection - Fast Shipping.
keyring.com
(picture also attached)
It is an air hose quick disconnect with two holes drilled into it for the split rings. All nickel-plated steel, made by Amflo in Memphis, TN. Quality that is worth the additional dollar or two IMHO to ensure the cap does not depart your keyring after six months or experience corrosion (like a cheap one from Amazon might do). They are kind of hard to find actually, but I found them at the link above and they are only $8 each.