Poweka 5 Snap In Primer Bulb fit for Stihl Homeliter Ryobi Echo Walbro Trimmer Zama Mcculloch Poulan Ryobi 683974B Oregon 49-088-0 New high quality aftermaket replacement parts Suitable for the majority of walbro carburetor and zama carburetor Replace mtd 791-683974B ryobi 683974B oregon 49-088-0 Height:31.4mm / 1.236inch ,wide:21.4mm / 0.842inch Package includes 5pcs x primer bulb