Sprite Science&trade; General Snap-In Primer Bulb for Stihl / Weed Eater / McCulloch / Ryobi Echo (5pcs) New high quality aftermaket replacement parts. Fits for the carburetors of chainsaws, blowers, trimmers, that have the snap in primer assemblies, such as McCulloch, Craftsman, Husqvarna, Poulan. Sears, Echo, Troy Bilt, Weed Eater, Ryobi, Stihl, Ryan and many more.