This item replaces the side valve of S10/FM12 gas mask. This allows you to customise the colours on your mask.
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This component replaces the original side valve unit on the S10.
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This unit simply screwed tight with the included nut.
 
This item by standard is a two way valve - great for rebreathing. If you would like it to be a oneway valve you will need to use the rubber flap/valve which comes with the standard gasmask valve. The rubber flap does not make a 100% airtight seal.