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What are the black rings fitted to the filler caps on my A3?

April 26, 2017A3 Black caps filler fitted Rings

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What are the black rings fitted to the filler caps on my A3?

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A. These are ‘seals’, or ‘o rings’, that ensure that a tight seal is made during steaming up/running. If the black seal on the boiler filler cap is not present or it has been split, steam will only leak from the boiler overflow rather than be pushed through to the safety valve/superheater. Likewise, if the smaller seal is not fitted suitably to the oil filler cap, problems will arise during running. Spare seals are available from Live Steam service dealers or Hornby Customer Care (part no. X9535).