I picked these up a while ago from another member, but I didn't find a use for them. They are 316SS bulkhead fittings I was going to use to install weldless fittings on my kettles, but instead went with dimpled solder connections.
The outside threads are 3/4" NPS with locknut, while there are 1/2" NPT threads from both sides on the inside. You would need a #215 o-ring to go between the locknut and kettle wall to make a weldless leak-free connection. Unfortunately I don't have any of the o-rings that go with this.
$28 shipped for both of these.