[Lifetime Warranty] 99944200903 Speed-Feed 450 Trimmer Head (2026 Upgraded)

99944200903 Speed-Feed 450 Trimmer Head

Key Features

• High-capacity, bump-feed design for line advancement.
• Allows for rapid reloading of trimmer line without disassembling the head.
• Holds up to 20 feet of 0.095-inch diameter line.
• Internal design with a split spool minimizes line tangling and welding.
• Includes a 10mm x 1.25mm Left-Hand (LH) thread adapter for mounting.

Replaces / Cross-Reference Part Numbers

• ECHO OEM Part Number: 99944200903

Compatibility & Fitment

• Fits most ECHO straight shaft string trimmer and brushcutter models.
• Compatible with models such as the SRM-266.
• Requires a 10mm x 1.25mm Left-Hand (LH) threaded arbor for installation.

When to Replace

• Existing head is cracked, broken, or excessively worn.
• The bump-feed mechanism no longer advances the line correctly.
• Line becomes frequently tangled or jammed inside the spool.
• The bottom cap or eyelets are worn through, causing line to break.

Installation Tips

• Disconnect the spark plug wire from the spark plug before servicing.
• Insert a locking tool into the designated hole to prevent the head from rotating.
• Unscrew the old head by turning it clockwise (reverse or left-hand thread).
• Thread the new head on by turning it counter-clockwise until it is hand-tight.