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Reusable respirators, specially designed to give an excellent comfortable fit, they have a soft, pliable silicone face seal and unique adjustable head harness. The 3M Cool Flow exhalation valve is fitted to reduce breathing resistance helping to minimise heat build up inside the mask; the special thin nose bridge gives improved flexibility and reduced pressure. Two lightweight filters, one each side of the face piece click securely in place using a simple bayonet system. Supplied without cartridges or filters so that you can choose the correct one for your working environment. The filters can be fitted in one of three configurations: 1) gases and vapours, 2) gases, vapours and dust, 3) purely for dust. Please note filters need to be purchased separately. EN140:1998/CE marked. 3M 7500 respirators are reusable. For convenience, they can be easily stripped, cleaned, maintained and reused. Replacement filters whilst not indefinite, last far longer than single use disposable respirators.