3MR6100DD / 6100DD RESPIRATOR 6000 SERIES HALF MASK SZ Half Facepiece 6000 Drop Down Series, Reusable The 6000 Drop Down Series facepiece incorporates a unique drop down head harness system so workers leaving the contaminated area can more easily communicate without totally removing the respirator. It is designed for workers who wear hard caps with or without liftable face shields. With this system, the facepiece drops straight down onto the chest by detaching the neck strap. The facepiece is available with spare parts. NIOSH approved. Sold individually. Use with 2000 Series, 5000 Series, 6000 Series and 7093 filters, cartridges, and accessories.