Black standard 'NATO' style Empty Gas Mask Filter
Fits all standard 40MM thread Gas Masks
Solid durable design 
If you're unsure if this will fit a certain mask please contact us and we'll be happy to help with any queries
Fill it with whatever you choose, yesterday's jockstrap, a cloth soaked in poppers or even both
Attach it to your subs favourite Gas Mask to force them to inhale whatever you desire 
Your only limit is your wildest fantasy