has anyone had problems with this fitting leaking ???
No, I didn't have any problem with it leaking. Is it coming from the "o-ring" at the base, or from the swivel? If the swivel, take it off the reg, and press the shaft out and check the "o-rings" in side, there should be two. Sometimes, they can get cut/torn during assembly. A little silicone grease on it before re-assembly helps with this.
Hope this helps,
I never had a problem with it , all I had to do is lubricate the o rings and check it before and after a dive.
I have had no trouble through 16 months and almost 40 dives.
None at all thus far, I have had it for less than a year and have regular use (swiveling) with it over about 75 dives, including surviving international baggage handling. As this ages I have an eye to the o-rings which appear to be easy to self replace. I use this for a dry suit inflator to route the hose, I am more comfortable with that use as opposed to breathing air supply. The Omni-Swivel brand are best, I have both and with I only had Omni-Swivel.
I have had this for over 6 years now without a problem. I just make sure each year I grease or change the o-ring.