Other sources of irritating noises-
The metal concertina pipe contains a sleeve welded at the top end- hence the direction arrow. The concertina must be flexible, but it still needs to guide gases.
The sleeve can break loose. It rattles inside forever more, or until the pipe/sleeve are removed.
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I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor
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