Originally posted by metho
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Same with the steam valve. Remove it from the top of the boiler if and when necessary. Replace the o-ring with a new one in the correct size. It is a bit of a trap as it's a larger o-ring than you'd expect and doesn't fit snuggly onto the inlet of the steam valve but rather sits there quite loose. When the steam valve is refitted and the bolts tightened it gets flattened to make a good seal.

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