99944200240 curved shaft two-line head has been replaced by 99944200908 Echo curved shaft Speed Feed Head at $24.99 retail
This Echo labelled clamshell packaging includes adaptors to work on select Right Hand thread Echo, Homelite, Husqvarna, Jonsered, Maruyama, McCulloch, and Shindaiwagrass trimmers.
Current trimmer heads for Right Hand thread curved shaft units
21560040 Echo GT single line Head $24.99 retail
99944200908 Echo RH Speed-Feed Head $24.99 retail
99944200907 400 LH/RH* Universal Echo clamshell package at $28.99 retail
78890-30000 400 LH/RH* Universal Shindaiwa clamshell package at $28.99 retail
*Left Hand Speed Feed head includes Right Hand core and adaptors to mount to curvedshaft Shindaiwa, Echo and other brands.