7800 Series Full Facepiece The 7800 full facepiece has a speaking diaphragm for clear communication. Nose cup helps prevent lens fogging. Scratch-resistant polycarbonate lens offers a durable, wide angle view. Soft silicone with a dual surface face seal conforms comfortably to the face. Easy adjust, non-slip, 6-point headstrap suspension provides a secure fit. Large inhalation and exhalation valves for easier breathing.