Do you mean the boiler to base gasket? If your boiler is not loose (rotating) then leave alone. If it is loose then a 3-pronged oil filter wrench will do the job.
This gasket here:
I don't see how to replace it without removing the boiler from the base.
I'll try a 3 prong wrench. Pray 4 my knuckles.
@NotThamesWater started
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Do you mean the boiler to base gasket? If your boiler is not loose (rotating) then leave alone. If it is loose then a 3-pronged oil filter wrench will do the job.