Membrane kit for half mask SR 100 secure that you keep your Half-Mask Respirator functioning effectively and lasting longer. The kit contains 1 pcs inhalation membrane, 2 pcs exhalation membranes, and 2 pcs protective caps. Meets and exceeds NIOSH standards for air purifying respirators. FEATURES: Exhalation valves reseal instantly with each breath securing an extremly high protection factor Protective caps made of high quality nylon plastic material Membranes made of heat treated silicone Protective caps are specifically designed to protect the membranes and the sealing area of the valve seat Membranes in orange color for easy inspection prior to use This membrane kit provides valve replacement for SR-100, SR200, and SR 90-3 (Next generation of SR90 Respirator) KIT INCLUDES: Kit for half mask SR 100 and SR200 1 pc inhalation membranes. 2 pcs exhalation membranes. 2 pcs protective caps. PRODUCT SPECIFICATIONS: Depth: 0.5 Height: 2 Width: 2 NIOSH Classification: P1