SUNREEK8482;General Snap-In Primer Bulb for Stihl/Weed Eater/McCulloch/Ryobi Echo (Pack of 5) 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. Hgh quality replacement primer bulb Replace WALBRO 188-512 188-512-1 Refer to part numbers 01183, UP04033, 300780001, 300780002 & 300780004 Replace mtd 791-683974B ryobi 683974B oregon 49-088-0,Bin number 188-512 Height:31.4mm / 1.236inch ,wide:21.4mm / 0.842inch