Can be used as either intake pre filter or exhaust muffler. These filter air entering unit when used as a filter and reduces sound when used as a muffler on exhaust side. Air filter assembly w/ 1/4" MNPT (includes internal filter felt, item # AB300B) for FB109D diaphragm compressor and all piston compressors including AQ101C, AQ201C, and AQ401C.
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