The SGE 400/3 Gas Mask/40mm Respirator offers CBRN and NBC protection with a 40mm NATO threaded standard filter compatibility. Manufactured in the United States, this gas mask is suitable for use in NBC and CBRN environments with the appropriate filter. It features impact protection capabilities and does not include a drinking system but is compatible with its corresponding drinking system. Available in regular size (Medium/Large) with a smaller size option also available, making it suitable for various users. This gas mask is a reliable piece of militaria gear for personal protection in hazardous situations. This mask is in excellent condition. I put it on once to test it then put it back in my storage bag. I washed it in soapy water as per the manufactures instructions before photographing it.