They're pretty thin walled as far as tube fittings go, but being made from 304 stainless steel there should be little or no corrosion breakdown when using water of an acceptable pH. so the walls can be thinner. I installed them on 304 MNPT stainless steel fittings. There was some tendency to bile, but not enough to cause any problems. Seals well when used with PTFE pipe tape. In general, they cope with the task.
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