I wasn't sure what filter I needed for my 21 gallon Harbor Freight Central air compressor. This turned out to be too big. The one I needed and kept is Solberg FS-06-050. I was very happy with the results. While some people say it doesn't reduce noise, it really does. This compressor is damn loud so don't expect miracles, but it works a heck of a lot better than anyone else. For real.
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