HIPA (Pack of 3) 570682 570682A Primer Bulb for Tecumseh Snow King HMSK100 HMSK105 HMSK110 AV520 Snow Blower Replacement manufacturer part number: 570682 570682A Fits Tecumseh Snow King Engine HMSK100 HMSK105 HMSK110 Fits Tecumseh snow blower AV520 Package include 3pcs primer bulb