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Product Description:

  • Speed-Feed 450 Trimmer Head Replace Manufacture part number: 99944200903 78890-21001 X047000940; High capacity trimmer head diameter: 4-1/2 inch; 10mm x 1.25mm LH thread
  • 99944200903 Trimmer Head Compatible with Echo SRM-266, SRM-266S, SRM-266T, SRM-266U, SRM-280, SRM-280S, SRM-280T String Trimmer Parts SRM 266 Weed Eater Head
  • SRM 266 String Trimmer Head Compatible with Echo SRM 266S Replacement Head Trimmer Head Speed Feed 450 Replace for Stens 385-288 99944200903 78890-21001 X047000940
  • Fits for Echo SRM-266 S/N: T41913001001 - T41913999999; T42011001001 - T42011999999; T42112001001 - T42112999999; T42211001001 - T42211999999; T42312001001 - T42312999999; T43313001001 - T43313999999
  • Fits for Echo SRM-266T S/N: T42411001001 - T42411999999; T42512001001 - T42512999999; T43413001001 - T43413999999; SRM-266U S/N: T42712001001 - T42712999999; T43513001001 - T43513999999.

Package include: 2 pc trimmer head
Replace OEM Part : 99944200903
diameter: 4-1/2 inch; 10mm x 1.25mm LH thread

  • Replaces Speed Feed 450

Fit For the following models :

SRM-266 S/N: T41913001001 - T41913999999

SRM-266 S/N: T42011001001 - T42011999999

SRM-266 S/N: T42112001001 - T42112999999

SRM-266S S/N: T42211001001 - T42211999999

SRM-266S S/N: T42312001001 - T42312999999

SRM-266S S/N: T43313001001 - T43313999999

SRM-266T S/N: T42411001001 - T42411999999

SRM-266T S/N: T42512001001 - T42512999999

SRM-266T S/N: T43413001001 - T43413999999

SRM-266U S/N: T42712001001 - T42712999999

SRM-266U S/N: T43513001001 - T43513999999

SRM-280 S/N: S66511001001 - S66511999999

SRM-280 S/N: S74012001001 - S74012999999

SRM-280 S/N: S81513001001 - S81513999999

SRM-280S S/N: S66611001001 - S66611999999

SRM-280S S/N: S74112001001 - S74112999999

SRM-280S S/N: S81613001001 - S81613999999

SRM-280T S/N: S66711001001 - S66711999999

SRM-280T S/N: S74212001001 - S74212999999

SRM-280T S/N: S81713001001 - S81713999999

SRM-280U S/N: S67511001001 - S67511999999

SRM-280U S/N: S75012001001 - S75012999999

SRM-280U S/N: S82513001001 - S82513999999

Compatible with following models:

SRM-266U 25.4cc Straight Shaft Trimmer/ Brushcutter

SRM-266S (T42211001001-T42211999999) Steel Drive Shaft Trimmer

SRM-266S (T42312001001-T42312999999) Steel Drive Shaft Trimmer

SRM-266S (T43313001001-T43313999999) Steel Drive Shaft Trimmer

SRM-266T (T42411001001-T42411999999) High Torque Trimmer

SRM-266T (T42512001001-T42512999999) High Torque Trimmer

SRM-266T (T43413001001-T43413999999) High Torque Trimmer

SRM-266U (T42712001001 - T42712999999) Straight Shaft Trimmer / Brushcutter

SRM-266U (T43513001001 - T43513999999) Straight Shaft Trimmer / Brushcutter

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