This is stainless steel extension kit was made for extending height of 35L Brewzilla or 35L Digi Boil to a bigger capacity from 35L to 47L maximum. It can be add-on the current 35L Brewzilla or 35L digi boil you purchased. This is a weldless fitting can insert into 65L Brewzilla or digi boil with silicone seal around and clips to hold it tight.
With this extension kit you are able to brew more in the current 35L Brewzilla or 35L Digi boil. Or you can boil more wash if you are running the 35L digi boil as the boiler of a still.