Yes this is still that very same thick walled Hexoloy carbide tube i bought on ebay , i had a 1 inch galv reducer down to 3/4 i turned the thread out of the 1 inch side so it was a plug fit into the nozzel and then just pushed it in firmly .
Bruce if you remember i did say i would try those sand blast nozzles as soon as i take the old one out , but the way this nozzle is holding out i may have to wait a while longer still , still not got round to building a down draft gasifier yet and was going to use those 3 nozzles on that one .
I had tried many types of materials on my nozzles over the past years and the refractory cement i cast around a tig nozzel worked the best, a working life of around 100 /200 hours , it was a large heavy lump and in the end would always turn to molten glass or crack and break apart ,
Matt i was going to ask what you have used for a nozzle on your latest cool charcoal build ,but if you want reliability for cheap then you be hard pressed to find something as long lasting as these tubes .
https://www.ebay.com/c/1832907530
Dave