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take about a 4" length of PVC (3/4" or 1" will do), and cap it. Then, drill both ends just large enough to run airline through both snuggly. Put the airline in the one end (er, the valve I suppose), and then put another piece of airline on the other. I you can, overlap the two airlines inside the PVC... this is how a car muffler works. Anyways... that will kill the noise.
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-Al Einstein
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