The high capacity tank and integrated front-mounted squeegee assembly with rear foot pedal actuator The Clarke Summit Pro 18SQ wet/dry vacuum is highly versatile. The Clarke Summit Pro 18SQ comes with to help you remove dust and get into tight places The Clarke Summit Pro 18SQ is a 18 gallon commercial grade wet/dry tank vacuum. The Clarke Summit Pro 18SQ commercial wet/dry vacuums incorporate the technical excellence and attention to detail that make Clarke the brand of choice among cleaning professionals.