Echo 99944230001 Edger Gearbox Attachment For Select SRM ModelsEcho 99944230001 Edger Gearbox Attachment For Select SRM Models Echo's edger attachment (99944230001) offers homeowners versatility and flexibility with converting certain SRM and BRD models into an edger. Easily change the trimmer head or bed redefiner head from one of the models listed below to the edger attachment to give you more versatility with one single unit. Features: Ideal for homeowners Compatible with Echo SRM models: SRM 230, SRM 2620,