Echo SRM-225. Is this air knob? What would I ever need to adjust it for? Manual doesn't even acknowledge it. Not sure if I need it tight when stored and loose when
Echo SRM-225i Trimmer Review
ECHO SRM-225 21.2cc Gas Straight Shaft Trimmer | The Home Depot Canada
ECHO Shaft Trimmer 21.2 cc Gas 2-Stroke Straight ECHO SRM-225 pro-grade 743184510971 | eBay