Back on topic - my memory in post #10 is a bit fuzzy unfortunately.
Digging through my emails at work today the alert we had a QFLink not long ago was about a rubber HP line that let go on an oxy rig and they were recommending we change to the teflon lined steel braid type ones.
Didn't apply to my base as our rigs have copper pigtail piping from bottle to manifold.
Sorry 'bout that.