![Purchased a GP5 today, came with this barrel filter I guess you could call it and a 40mm hose. Is this safe to use? It's marked 11 and 6(or 9) on the Purchased a GP5 today, came with this barrel filter I guess you could call it and a 40mm hose. Is this safe to use? It's marked 11 and 6(or 9) on the](https://preview.redd.it/8w44lwz7y6041.jpg?auto=webp&s=a2dae47a15da9355dc40e8d5ad2c0044375bd543)
Purchased a GP5 today, came with this barrel filter I guess you could call it and a 40mm hose. Is this safe to use? It's marked 11 and 6(or 9) on the
![So my brother got a GP5 in Petersburg, Russia. This was written on the filter. Can anyone explain how to read this? : r/gasmasks So my brother got a GP5 in Petersburg, Russia. This was written on the filter. Can anyone explain how to read this? : r/gasmasks](https://preview.redd.it/ns3n4ehc0hf31.jpg?auto=webp&s=3dad0f168be774db09b26100f7719c5134516328)
So my brother got a GP5 in Petersburg, Russia. This was written on the filter. Can anyone explain how to read this? : r/gasmasks
![MILITARY SURPLUS Soviet Gp-5 Gas Mask With Bag And Filter - Check out Our Selection of Genuine Military Surplus Gas Masks - MILITARY SURPLUS USED CORE WAREHOUSE MILITARY SURPLUS Soviet Gp-5 Gas Mask With Bag And Filter - Check out Our Selection of Genuine Military Surplus Gas Masks - MILITARY SURPLUS USED CORE WAREHOUSE](https://www.mitchellsadventure.com/user/images/10684.jpg?t=1811281507)