Package includes: 1 piece of carburetor Model difference:The distinction is that the power is generally used for water pumps, and the unit is usually used for generators for 2000-2500 power170 for 2500-3000 power188 for 5000-6000 power190 for 6000-8000 strength 188 and one hundred ninety model have handbook damper and automatic damper contrast Model Description:168 mannequin unit (for generator), suitable for 2000-2500 power168 mannequin strength (for water pump), suitable for 2000-2500 rateModel a hundred and seventy (for generators) for 2500-3200 powerModel a hundred and seventy power (for pumps) for 2500-3200 powerModel 188 (for generators) for 5000-6000 powerModel 188 power (for pumps) for 5000-6000 power190 mannequin unit (for generators) for 6000-8000 power190 model strength (for pumps) for 6000-8000 energy