GM15, Gummimaske 1915
Rubber coated canvas with metal eyepiece assembly and antifog inserts. To breathe you have to blow out, hard. The filter consists of three layers varying between combinations of activated carbon, 40% potassium carbonate and diatomite soaked with hexamine and piperasine. The mask is connected via a hose to a rebreather, either a bladder or tank such as the Pneumatogen 1908 or H.S.S. Gerät 1916.
>>5684563QM: I should also mention: for the purposes here, shooting at and hitting the Trench Raider with just 1 bullet will not damage his equipment (compared to him being shredded / blown up by a mine). You can just assume that his gas mask comes equipped with all the various attachments mentioned above etc.