The new Fein Turbo III 15 gallon dust extractor has been redesigned with an optimized shape and 6 wheels instead of 4 for added stabliity. And, at an average of 60 decibels, they are far quieter than most other popular vacuums. All three models come with a variable suction control, the suction can be adjusted via a simple and durable switch. Variable suction control saves energy and reduces noise level to an absolute minimum. The Turbo III now has an integrated drain plug. All models can be used wet or dry by first taking out the cloth filter bag and adding an optional foam filter. Fein also has accessory filters available that capture particles down to .3 micron ( HEPA ).