The collapsible wall model containment berm features rugged PVC sidewall assemblies for sidewall support Simply swivel the ""feet"" of the PVC supports to lower or raise the sidewalls in just seconds Rugged materials provide years of service and excellent chemical compatibility Add the Ultra-Self Bailer to keep rainwater out of the spill containment berm Rainwater drains from the berm passively but will automatically shut off if there is a spill Standard material of construction is Copolymer-2000. Other materials available upon request Side Wall Support Type Hinge Bracket