U179935 / 9935 SELF BAILER 36"X24"2" UItraTech Ultra-Containment Berms® Ultra-Containment Berms® feature unique sidewall supports that have a two-way "living hinge." This means that drums and even trucks can be rolled on and off the containment surface, and the sidewalls will automatically spring into their vertical position. The Ultimate Model is ideal for secondary containment of tankers, trailers and other vehicles. Entry and exit walls are supported every 12" with patented "living hinge" supports, so there is no need to manually raise or lowerthe endwalls when driving through. Sidewalls are held upright by simple swivel PVC assemblies for added convenience. The Ultimate Model is constructed of Copolymer 2000™.