Oregon 49-088-0 Primer Bulb Lawn Mower Replacement Part Oregon 49-088-0 Replacement Primer Bulb For Walbro, MTD and Ryobi carburetors Fits WT23A, WYJ33, WYJ34, WYJ45 and WYJ86 carburetors Replaces Walbro 188-512, MTD 791-683974B, Ryobi 683974