I fab it from raw material. 1 1/2 tubing, 2- 3/8 half couplings, a 1/4 half coupling for the temp sensor, and I machined a end cap with 1in Npsm threads in it for the heater. The conduit box I made with sheet metal end caps and piece of 3in tube. All 304 stainless, tig welded and electro polished.
I'm thinking I may remake it thou because I think i may put a tri-clamp on the end. Then thread a cap to put the heater in so it can be removed easy, to clean the element.