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The P 531 was an Italian gas mask made by Pirelli for industry use and exportation.
Mask overview Edit
The P 531 mask's face piece was made of a two layers beige rubber, milled on the outside and smooth on the inside. The head harness had five straps, two of which have hooks to quickly don the mask without having to field adjust. The eye pieces were made of three layers, two glass ones and a cellulose one that tended to become orange over time. The mask sported a tissot system to prevent fogging. The exhale valves were located on the cheeks and each of them was held on by a screw-able lid. The intake is connected to the mask at the bottom. The filter itself was attached through a pleated hose to the aforementioned piece and itself was stored in its bag.
The mask was issued with a filter that depended on the kind of protection required in the buyer's working condition. The most common filter was the "Tubin", a metal box similar to the one of the Penna.
The mask was used in two configurations. With the first one, the mask came with a satchel similar to the one of the Penna respirator: it had two sections, one for the mask and the other for the filter and hose. The filter section had holes to allow air flow. The main strap had a special buckle to be shortened when the mask was in use; the small string on the side of the satchel helped keeping the aforementioned firmly onto the wearer's chest. In the second configuration, the filter was put in a small cage satchel on the wearer's chest.
Sometimes the kit is supplemented by a stick of anti-fogging soap to aid the mask not to fog.