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18KHZ Variable Frequency Pulse Width Modulator 35 Amp Variable Frequency Pulse Width Modulator For Hydrogen Generators Variable from 33 HZ-18 KHZ    RARE… Super Big Block 1512 kit W/ hho pump & Fan + 18KHZ Variable Frequency Pulse Width Modulator  = $1,999.95 Call for dealers pricing 813-931-9767 Dealers cost  $1,500.00 With training video   Use to test Installs Model: Series Big Block 1512 HHO Gen Water Fill Mode: Automatic Cooling System: Air Cooled Dimensions: Height 7.625", Width 7.625" x 8.0" Engines: For testing vehicles autos/heavey pickups:. Fuel Type: Gasoline, Ethanol, Natural Gas, Diesel