99944200903 Speed-Feed 450 Trimmer Head - Fits Echo SRM-266, SRM-266S, SRM-266T, SRM-266U - 2 Pack Ver. 1 17211-Z8B-901 Ensures proper engine airflow and

Ensures proper engine airflow and filtration

Visible Darkening: If the clear glass has turned heavily frosted

3/4" NPT Threads

Significant loss of water-resistant properties

American Wick Standard: #4E

99944200903 Speed-Feed 450 Trimmer Head - Fits Echo SRM-266, SRM-266S, SRM-266T, SRM-266U - 2 Pack Ver. 1 17211-Z8B-901 Ensures proper engine airflow and99944200903 Speed Feed 450 Trimmer Head Key Features 30 Second Reload: Engineered with "Speed Feed" technology that allows the spool to be reloaded without disassembly. Simply align the arrows, feed the line through, and twist the knob. High Capacity Spool: Designed for professional use, holding more line than standard manual heads to reduce downtime on large properties. Heavy Duty Bump Feed: Features a reinforced, high impact bump knob and