Primer Bulb / Lawn-Boy 610482Pack Size:1Lawn-Boy 610482, Lawn-Boy 607310ESF 137-125, Foley/Belsaw 5979152, Foley/PLP 137-125, Green Meadow PB125, Laser L2733, Laser 98032, NHC 262-9480, Oregon 07-105, Prime Line 7-02310, Rotary 7236, Sunbelt LB-80, Sunbelt B1LB80Lawn-Boy 1974 and newerOD: 1 3/16 ", Height: 7/8 ", Ethanol: Not compatible with greater than 10% ethanol fuel, Mounted on engine shroud