Primer Bulb (Pack of 10) replaces Walbro 188-12 188-14 188-17 Size 3/4 inch (19mm) O.D 9/16 inch (14.28 mm) H.T High quality aftermarket primer bulb Replaces Walbro # : 188-12, 188-14, 188-17, 188-12-1, 188-14-1 and 188-17-1 Fits Walbro carburetor models : WA, WT, WY, WYJ, WYK, WYL,WYP and WZ that use a 3/4 inch (19mm) O.D 9/16 inch (14.28 mm) H.T primer bulb Package include 10pcs of primer bulb