Carburetor / Walbro HD-12-1Pack Size:1Husqvarna 503 28 16-20, Husqvarna 503 28 18-01, Walbro HD-12-1, Walbro HD-6BHusqvarna 362, 362 EPA, 371 and 371 EPAEthanol: Not compatible with greater than 10% ethanol fuel