Imperial Industries slide-in tank units, distributed by Armstrong Equipment, are manufactured in steel, aluminum or stainless steel, with standard sizes of 300, 450 and 550 gallons (single and dual compartment). Pump and motor combinations are available ranging from Masport HXL3 and 4 or Conde Super 6 and SDS 6, coupled with a Honda gas or optional Yanmar diesel engine. Each single-compartment unit comes with an 8-inch primary shut-off, poly secondary scrubber, 30-foot intake hose with PVC wand, 3-inch discharge, and zinc anode for corrosion protection for aluminum tanks. Dual-compartment tanks add a 50-foot water hose, 2-inch water fill port and Whale washdown pump. 800/699-7557; www.vacpump.biz.