allen sds 20 brush-cutter

hi i had this brush-str.jpgstr1.jpgcutter given to me recently not running, on the shaft it has a sticker saying allen sds 20 i need a petrol bubble pipe as shown i cant find anything out online about allen strimmer's does anyone know if other makes are same (hayter, ryobi,ect) thanks.

Attached Images

• str.jpg (74.2 KB)


• str1.jpg (63.5 KB)