• Tank capacity refers to actual tank volume and does not reflect capacity available during operation. • Peak Horsepower" (PHP) is a term used in the wet/dry vacuum industry for consumer comparison purposes. It does not denote the operational horsepower of a wet/dry vacuum but rather the horsepower output of a motor, including the motor’s inertial contribution, achieved in laboratory testing. In actual use, motors do not operate at the peak horsepower shown.