The rubber o-ring is original and I am unsure of the born on date, so it may not have the original longevity.  The rubber is flexible and strong in a sampling of fittings I disassembled and stretched and felt the rubberiness of. 

The caliper in the photos is not for sale, just to show measured dimensions.

If you want multiples I will use inexpensive shipping and refund the difference between that and ebay's estimates.

Please see other types and sizes of ultra-torr fittings available from me.