MSA medium advantage 4000 single port facepiece with nosecup is made of hycar material and reduces fogging in low-temperature or high-moisture environments. Facepiece is ideal for asbestos abatement, welding, sanding and grinding applications. It is compatible with several MSA respirator models including air-purifying respirators, supplied-air respirators and powered air-purifying respirators. It is comes in three standard sizes for a comfort fit and is NIOSH approved.