One of the main and most important components of a good HHO system is the PWM (Pulse Width Modulator). This small electronic circuit board controls the electrical current flowing through the HHO system and regulates the flow so that the best possible hydrogen is produced and maximum fuel savings are achieved. If your running any HHO generator you will need our PWM60A to better control the amperage, prevent the system from overheating and have more HHO gas emissions. This is one of the most important gadgets in your HHO system. Maintains the correct gas/water ratio to make your engine run smoothly and efficiently by quickly buttoning the power on and off. This prevents the HHO generator from overheating and keeps things at a manageable temperature. Ampere Control: Controlling the amperage e