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Not enough have you done the meshmod on it? For a silencer take a small pill jar and drill a hole in each end just big enough for the 1/4" tube, slide a small piece in the one end and your venturi tube in the other, put a small piece of paper towel in it, no more sound.....a poor man's silencer ; ) You can try to restrict the pump with a ball valve but i personally wouldn't.
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There's no such thing as a normal reef, there's just reef
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