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Impact attenuators displace the kinetic energy of a vehicle, away from the solid block of concrete to the barrier and gradually slow down the vehicle. Sand Barrier by PowerPak is a durable and dependable impact attenuator. It comes in a set of 3 (200 lb, 400 lb, 700 lb). Each barrel has a different configuration and enables easy external sand weight verification. This road safety barrier boasts of a durable construction from a single piece of polyurethane plastic that eliminates sand leakages. It does not feature any core insert, facilitating easy shipping, storage, and installation. Each barrel comes tested and certified to meet the crash-worthy requirements of NCHRP 350.