I don't know.. I don't know anything about him or this tank, other than it was $100 from craigslist, and I already had this thing off in my hand, there are 2 little black rubber seals inside that "look" ok but it does slide in and out really easy.. I'll take picturesIf you do take the needle valve off, its going to take some force.Normally they use a sealant around the screwed in areas and only when they get unscrewed do they normally leak.Did the previous owner do this?