![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-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](https://preview.redd.it/n9nmhqfocr831.jpg?width=640&crop=smart&auto=webp&s=2b8acc1fafdce587d67e53481586a3b2407bed5f)
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
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Amazon.com: HUZTL SRM 225 Carburetor Air Filter Cover Tune Up Kit for Echo SRM-225 GT225 PAS225 PE225 SHC225 PPF225 Trimmer Weedeater Engine Carb : Patio, Lawn & Garden
![Amazon.com: Welironly New OEM Zama RB-K93 Carburetor Carb for Echo SRM-225 SRM-225i String Trimmer,#id(theropshop; TRYK32271418650738 : Patio, Lawn & Garden Amazon.com: Welironly New OEM Zama RB-K93 Carburetor Carb for Echo SRM-225 SRM-225i String Trimmer,#id(theropshop; TRYK32271418650738 : Patio, Lawn & Garden](https://images-na.ssl-images-amazon.com/images/I/51WMbB0D0sL._AC_UL600_SR600,600_.jpg)