Also never heard of such a thing. I'd remove the fitting, cap or plug the hole & take a spare with me! No telling what brand it is without removing it, I suppose.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.