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This is a closed cap to fit into our screw system for 3M 6200. You can use this to test whether your screw is italled correctly and if there is any air leak. OR simple shut off one side and use one filter if thats what you want. CAUTION DO NOT ITALL 2 CAP ON YOUR MASK WHILE WEARING IT. YOU WILL SUFFOCATE! KEEP OUT OF REACH FROM CHILDREN. CAUTION