eelnoraa
Contributor
It is kind of hard to see from your picture how bad the corrosion it. It is too blurry. Discoloration of the orifice metal seemed to happen to my HOG 2nd stage as well. The threads on mine turned into dark brown color. I have tried vinegar, ultra sonic and tooth blush, and I can't get those brown color off. When touch, they feel flat and smooth, so I don't think it is corrosion. It is more like the surface finish is missing. Mine has never welded solid, I can always unscrew it easily. I check mine often now.