I picked up this Gas mask from BUDK for 10 bucks on sale. Its old Czech surplus but fun to mess around with. The filter install is a little tricky so I did up this vid. Hope it helps yall.
This mask looks to be a #2 (Medium) It seemed a bit small for me but I got it to seal. I always fit tested the best for a size L but would also pass for a size M.
www.budk.com
