Snap in Primer Bulb11510 , Fits most small engine carburetors that require a fuel primer push / pump bulb. Part number: 188-512-1Has several applications with manycarburetors from Walbro to Zama (see size specification below)This is a verycommon primer bulb used onmany different brands of 2-cycle equipmentsuch as Blowers, Chain Saws, String Trimmers and more. Brands are Poulan, Weedeater, Ryobi, Ryan, IDC, Homelite, Lawnboy, Toro, McCulloch, and Stihl. Bulb has two fuel nipples (one shorter than the other) and two clasps that snap in.If you don't see what you want please contact us and we will be happy to help you find the right part for your project. We have access to hundreds of parts for small engines from gardening to kart racing.Bubble SIZE: Outside diam. atbottom lip is 18mm. Bottom inside diam. is 14mm. Height (thickness)of lip is 2mm. Bulb (pump bubble)outside diam. is 15mm.Total height (including bottom lip) is 13mm.--- OD: 0.755", Height: 0.560"Replaces manyWalbro and Zama carburetors that use the samepump bulbwith differentpart numbers. Primer bulb used onmany different brands of 2-cycle equipmentsuch asString Trimmers, Blowers, Chain Saws, Hedge Clippers and more. This will fit many applications Echo, Poulan Weedeater, Ryobi, Ryan, IDC, Homelite, Lawnboy, Toro, McCulloch, Shindaiwa and Stihl, New Echo, Zama & Walbro Primer BulbFits carburetorsthat need primer pump or if you want to add a primer pump to your existing application -- THIS IS ITOther part numbers that interchange: Lawnboy 607310 & 610482Ryobi 683974Toro 683974MTD 791-683974Homelite 01183This isa "snap in" primer pump bulb