One 1 NEW Echo air filter plus air filter cover and cover lid assembly for many Echo units. · CS-300 S/N 03001001 - 03999999-->Intake, Exhaust. · CS-300 S/N 04001001 - 04999999-->Intake, Exhaust. · CS-3000 Type 1 S/N 001001_Up-->Intake, Exhaust.
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