This pump features two tool “hot swappable” con- nections and two tool simultaneous use. The Eco-Silent power unit has two seperate pumping circuits that operate independently. The Eco-Silent has our patented Overdrive feature. This feature allows one tool to be used at twice the speed by combining the flow from both pump circuits into one, giving that tool more power to cut or spread. Most of all the Eco-Silent power unit is quiet with a decibel range of 63.9 to 79.6 dB at 1 meter (3.2 ft).