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Would you prefer rigid or flexible containment for your large tank? The Stinger PolyBerm spill containment system is both! This unique spill control berm uses a rigid plastic wall coupled with a flexible liner to create the sump area. Although the system is ideal larger containment projects, any sized berm is possible with this customizable product. Sections of three foot tall sidewalls can be connected until the desired length is achieved. Once they are in place, a durable liner is laid in place and connected to the walls. The structure is not connected to the ground, creating a permanent or portable large scale berm customized to fit your specific project.