M40-GAS MASK
Unit Maintenance Manual for Chemical-Biological Mask M-40, TM 09204A/09205A-20&P/4. M-40 Review. 1. Describe the problem with allowing water to get inside the canister. List three accessory items associated with the M-40 Field Protective Mask. Identify the first step in donning your gas mask once you have received word of possible contamination. 4.