The ends of this nozzle are closed off using two reducers. I ream out the restriction that prevents the smaller pipe (1") from stopping. The end is then brazed on where it is in contact with the charcoal. The end outside the gasifier is simply soldered on with tin. The concern about lime build up over time is possible but should be easy to fix with vinegar if it happens. During winter use, this water is changed every time you stop using the unit to prevent freezing.
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