Hi Martyn.
I just measured my original smoke discharger.
I can confirm the O/D is 4.5" and I/D 4" therefore wall thickness =1/4"
However the length of mine is nearer 9.5"....oow err missus!
Not sure what you mean about the nut? It's a nut with a hex on the back edge and heavy splined edge at the front for finger tightening. I can't remember what thread it is, but I can check if necc. I can also give dimensions of the nut if required.
Have a look at the state of my mounting bracket. I think it came from a carrier in Pounds yard that the tide had been coming in and over for years. Ron
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