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Laboratory tested NRR 21dB. Mounts to most hard hats without an adapter. Muffs swing up and out of the way quickly. At rest position eliminates contact with dirty hard hats, reduces contamination and cushions distortion. Works with AO Tuffmaster face protection system - The LR46 Hard Hat in both ratchet and slide lock versions has slots for the 2000H. The H20 headgear is made to fit into the 2000H.
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