The Self-Contained Slide-In Unit from Imperial Industries is offered in either a single compartment for grease or industrial sludge and the traditional two-compartment for the portable restroom cleaning industry. It has a horizontal freshwater tube and Extruded Skid design. Stock units are manufactured in steel, aluminum or stainless steel with capacities of 300, 450, 550 and 650 gallons, equipped with the option of Masport or Conde vacuum pump packages with Honda gas engines. 800/558-2945; www.imperialind.com.