MIFAB® MIFAB BIG-DECON decontamination tank has a limited lifetime warranty and is made in the U.S.A. out of seamless, rotationally molded High Density Polyethylene with 3/8” uniform wall thickness. Decontamination tank is designed for above or below ground installation and includes a direct connect lid system, 4” vent connection, and 4” no hub inlet connection. Composite lids provide a water / gas tight seal and have a minimum of 20,000 LB. load capacity – in accordance with the loading requirements of AASHTO H20. The high density polyethylene material is PE 3135 from Dow 9.39 with a density of 0.939 g/cm3.