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3M E-A-Rsoft FX 312-1274 Corded Earplugs — NRR 33 exhalation valve Can I knock the dustEDITORIAL REVIEW: 4. 5 5WC Safety Review 3M E A Rsoft FX 312 1274 Corded Earplugs Best For: corded single use foam hearing protection at NRR 33 dB with a retention cord. Not For: non noise hazards, or noise that earplugs alone can't bring under ~85 dBA (add earmuffs). Bottom Line: a solid corded single use foam plug at NRR 33 dB the cord earns its keep on jobs where dropped plugs get lost. Editorial assessment by Steven Eaton, WC Safety editor.