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Consolidation of concrete in forms is made easier with concrete vibrators PL15E, PL20E, PL30E and PL25BP from Doosan Infracore Portable Power. They offer contractors the right mid-frequency and force characteristics required to set particles in motion fast, for rapid consolidation of homogeneous mixes. All four models of concrete vibrators are designed to maintain optimum frequency regardless of slump, head size, or other load factors. Optimum frequency avoids the possibility of destroying important pressure-relief chains produced by small air bubbles. These relief chains are known to resist damage during freeze-thaw cycles in colder climates. These models are designed and built to withstand jobsite stresses. Their electric motors are protected by a high-strength cast-aluminum housing that also dissipates potentially damaging heat.