Reddit mentions of Weldless Bulkhead Fitting

Get a temp probe for your kettle. This one is pretty cheap, and another $10 for the bulkhead adapter.

It looks like you're trying to bubba a weldless bulkhead.


http://www.amazon.com/Midwest-Homebrewing-and-Winemaking-Supplies/dp/B0064OFGLO

It also looks like you're trying to use a hex nut as the connector that structurally supports two threaded pipe sections. This would work, provided you brazed the pipe sections to the hex nut, but Gluing them together probably won't work. You could epoxy them together, but I wouldn't expose epoxy to hot solvent vapors that are intended for consumption.

If I were you, I'd take the male side (which also has a female port on the opposite side, which you can see in the picture of the link, below) of a lead-free brass pipe union
http://www.amazon.com/Brass-Fitting-Union-Class-Female/dp/B004XEKWSY/ref=sr_1_2?s=industrial&ie=UTF8&qid=1463615762&sr=1-2&keywords=pipe+union+copper
and stick it in the hole you drilled for the "threaded nipple bolts" in your drawing. Braze it to the lid with silver solder using a TON of flux and a map gas torch, and then get a NPT threaded sanitary flange to connect to your vapor pathway. make sure you ptfe tape the NPT connection