4000 Series Silicone Full FacepieceSilicone facepiece available in small or standard sizes. Standard speaking diaphragm enhances wearer communiction. Easily convertible to Continuous Flow or Powered Air Purifying Respirator without the aid of tools. Choice of 4- or 5-point head strap eliminates hard hat interference and discomfort. Spectacle kit is easy to install; required no tools or mask disassembly.