What Are You Doing To/With Your Car Today?

69_340_GTS said

Those look like the power steering fittings on all the late model "metric" stuff. The o-ring goes in the groove behind the last thread of that male fitting. O-ring kind of gets crushed into the groove and into the chamfer on the 1st thread of the female part. Supposed to be good for 1000 psi or something.

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OK. Interesting that you mention "power steering". One fitting I did try unsuccessfully was listed as a PS fitting. It didn't have the O ring you described (pictured) and the fitting was turned in to the female bit as far as it would go, but never bottomed out on the O ring at the base of it.

As I mentioned above, I went with Teflon washers, but if those leak, I will keep this in mind. So...would that just be an "18mm O Ring"? I never saw washers, O rings, gaskets, wads of gum or anything on any Vendor webpage described as the right one for this job.....