Fit for ryobi Craftsman Homelite primer bulb Used on most echo, ryobi and homelite units with zama carbs. Size: Bulb height: 0. 75"(19mm) Bulb flange diameter: 0.85"(21.6mm) Bulb diameter: 0.725"(18.5mm) This is non original aftermarket parts, you will receive exactly showed on the picture, please check the pictures for compatibility before ordering it, we have the great confidence with the quality of our parts and provide 3months warranty too.