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