99944200903 Speed-Feed 450 Trimmer Head - Fits Echo SRM-266, SRM-266S, SRM-266T, SRM-266U - 2 Pack Ver. 1 17211-Z8B-901 Ion-Exchange Technology: Effectively removes calcium

Ion-Exchange Technology: Effectively removes calcium and magnesium ions from the water to prevent limescale accumulation within the boiler and internal tubing

which exposes high-voltage wiring

3/4" NPT Threads

Consult your opener's user manual for specific replacement instructions

Ensures proper engine airflow and filtration

99944200903 Speed-Feed 450 Trimmer Head - Fits Echo SRM-266, SRM-266S, SRM-266T, SRM-266U - 2 Pack Ver. 1 17211-Z8B-901 Ion-Exchange Technology: Effectively removes calcium99944200903 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