I ordered a couple of these as well. BTW, so far no degradation on my copper nozzle with 1/4 wall thickness, but I only have 100+ miles on my MGB. Also no corrosion on one-ended horizontal copper nozzle run for a few hours with no EGR on a small gasifier. I am looking for something other than copper for those wanting a less expensive, but durable option for small engines.
I’m thinking that I will slip the silicone carbide tube about half way over a 1/2" SS nipple. The expansion of SS is far greater than the silicon carbide so must be much smaller diameter than the nozzle. My thinking is that 1/2" will give good air velocity and the carbide will take the reaction temperature and prevent catastrophic oxidation of the recessed SS nipple.
The nozzle will hang loosely in a refractory cradle/notch allowing back and forth/end to end movement without crawling off of the nipple. The slight venturi effect sucking in CO2 from reaction into the nipple end of the nozzle should not overwhelm the entering air volume and might even help cool the reaction a bit?
Other’s thoughts are welcome.