Primer Bulb / Walbro 188-13-1Pack Size:1Walbro 188-13, Walbro 188-13-1Dealer Choice 33-1207, J. Thomas JT-5744, NHC 203-5764, Oregon 49-027, Prime Line 7-02386, Ratio Parts 615-744, Rotary 9479, Sunbelt WAL-188-13Walbro HDA and WYK carburetorsOD: 15/16 ", Height: 5/8 ", Ethanol: Not compatible with greater than 10% ethanol fuel