Looking online Parker calls these Triple Lok 2 soft seal fittings. They are 37 deg. JIC. Are they very common? Seems like they could solve a lot of leaking issues. Sorry for the blurry pic.
IMHO give them a swerve. My pet hate is any 0 ring fittings.
Here's another option for leaking JIC fittings, work pretty good if fitting is not too damaged: Sorry there isn't any picture for them, but they are thin copper gaskets that fit over the tapered end of fitting where the dimension "A" is shown. Won't seal a badly damaged fitting but work good for ones that just seem to seep.
Yeah they are common, I've used Teflon tape on the metal seal end before
Especially when you've got a cab jacked up to replace a hose you can barely reach, let alone get a pick in there to pop the old o-ring out.
Especially when you spend hours and dollars to replace an 0 ring that's worth only a few cents. Then to find out the 0 ring kit you have hasn't got the correct one.
Flare-Tite are a similar style sleeve that fits over the male end. I don't need to repair a leak, I just noticed these fittings when I took the articulation valve off the grader. There must be a reason they are used instead of standard JIC fittings?
It was a "better idea" to combat o ring face seal fittings. When GM built the Saturn plant the o ring seal JIC fitting was the standard. They were a pain in the butt and did not work very well.