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NATO 40mm Gas-mask restrictor cap for altitude training.

NATO 40mm Gas-mask restrictor cap for altitude training.

thingiverse

This is a cap which will fit any gas-mask with a standard 40mm NATO thread including S10, FM-12, Israeli civilian etc and thus allows you to use it as an inexpensive altitude training mask. The cap comes as standard with a single 8mm hole but you could adjust this is CAD to suit your requirements (STL and Fusion 360 files supplied).

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