Walbro primer bulb. The primer bulb draws additional fuel into the carburetor to make the engine easier to start. If the primer bulb is leaking, replace it.
Manufacturer #188-12-1
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Body-air purge
Manufacturer #5-2557-1
Suggested replacement is 188-12-1
Genuine OEM Part - Manufacturer #16032-ZM3-004
No longer available
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