Which of the following is NOT a boiler accessory?

Which of the following is NOT a boiler accessory? Correct Answer Mud hole (sight hole)

The correct answer is mud hole (or sight hole). Feed pump, steam trap, steam separator are all boiler accessories whereas a mud hole is a boiler mounting. Boiler mounting increases the efficiency of the boiler.

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Which of the following is a boiler accessory i.e., not a boiler mounting ?
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