OEM Primer Bulb / Walbro 188-12-1Pack Size:1Poulan 530-035496, Walbro 188-15-1, Walbro 188-15, Walbro 188-12, Walbro 188-12-1NHC 203-5484Walbro WA-225-1 and WT-379OD: 3/4 ", Height: 1/2 ", Ethanol: Not compatible with greater than 10% ethanol fuel