DOCHY 5pcs General Snap-in Primer Bulb for Stihl/Weed Eater/McCulloch / Ryobi Echo, Model: Replacement Parts Chainsaw Primer Bulbs Pump Fit Package include: 5 X Primer Bulbs Pump New high quality aftermaket replacement parts. Installation: Easy installation, No Installation Instruction Height:31.4mm / 1.236inch; Wide:21.4mm / 0.842inch 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.