Here's what i've got active and its not working. Now i have tried all kinds of combinations with synced modules and synced units to modules and all kinds of crazy combinations to search for something that might work but no combination did work. I also had tries when i had items separated by commas written down in the gasmask module since it dosent have to be a gasmask that protects you. But that didnt work either. Here are screenshots of my modules and the player rifleman who's testing the gas. And in the box is his gasmask.
http://imageshack.com/a/img923/5495/DEkCw6.png http://imageshack.com/a/img924/9004/VwrGWN.png http://imageshack.com/a/img924/9783/4TFzNJ.png http://imageshack.com/a/img922/2084/B3xUkY.png http://imageshack.com/a/img922/5766/lWujck.png http://imageshack.com/a/img922/7526/1QH4qC.png http://imageshack.com/a/img923/5052/LywkVu.png http://imageshack.com/a/img923/8070/OSCodq.png