user 31093
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My old pot was about 2mm thick, what I did was drill the hole just a little bit too small and turned the thread to it, stainless winning over aluminium the thread of the nipple cut a nice thread and it actually sealed without any o rings, though I put o rings on it anyway.manticle said:If weldless and the pot is thick enough, you may want to tap the thread*, which requires more tools but will be super easy. Long before I knew anything about anything, I just drilled 1/2mm smaller than my valve and wound the tap in with elbow grease.
*If it's only a 2mm wall thickness, there's not much point threading and locknuts and silicon washers will do everything you need them to. Even 4mm, you could get away with it as I have done - just don't drill your hole oversize.