The Self-Contained Slide-In Unit from Imperial Industries has an integrated horizontal water tube for equalized weight distribution between water and wastewater. Optional freshwater compartments or waste-only units are available, with a choice of Conde or Masport vacuum pump packages, with Honda gas or Yanmar diesel engines. They are available in stock sizes of 300-, 450-, 550- and 650-gallon capacities, and in steel, aluminum or stainless steel. 800/558-2945; www.imperialind.com.