![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://i.redd.it/8w44lwz7y6041.jpg)
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
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Russian Civilian GP-5 Gas Mask And Bag – Lightweight, Full-Coverage, Grey Rubber Construction, Sealed Eye-Pieces, Includes Filter
![User blog:JeromeZP/How to convert a GP-5 to 40 mm NATO (works with every 40 mm mask) | Gas Mask and Respirator Wiki | Fandom User blog:JeromeZP/How to convert a GP-5 to 40 mm NATO (works with every 40 mm mask) | Gas Mask and Respirator Wiki | Fandom](https://static.wikia.nocookie.net/gasmaskandrespirator/images/3/39/Maskaaaaaaa.jpg/revision/latest?cb=20190201190032)