MSA 10075908 Silicone Advantage 4000 Single Port Facepiece Assembly, Polyester Net Head Harness, Nosecup, Size L. Full Respirator, Facepiece Material Silicone, Full Face Suspension Type 4 pt. With Mesh Headnet, Head Harness Material Polyester, Bayonet, Cartridges Included No, M, Series Advantage(R) 4000 Series, Asbestos Abatement, Sanding and Grinding, Welding, Configured For SCBA, PAPR, CBRN. Precision crafted to cover a wide variety of respiratory applications, our Advantage 4100 Facepiece works with several different MSA respirators to provide comfortable, cost-efficient performance. The facepiece is compatible with several MSA respirator models, including air-purifying respirators, supplied-air respirators and powered air-purifying respirators. Available in both silicone and Hycar, this unit comes in three standard sizes for a snug fit. The facepiece also features a rubber or net harness, and every mask features a standard nosecup for reduced fogging in low-temperature or high-moisture environments.