GP-5 filter | Gas Mask and Respirator Wiki | Fandom
The GP-5 filter canister is a Soviet-made 40mm (GOST thread) combination NBC filter issued for civil defence purposes. Introduced during the 1960s, the filter, issued in the GP-5 kit, was mass-manufactured and is the most common filter in the world at present. GP-5 filters come in an olive-drab colored metal canister with a screw-on cap whose color varies on what batch the filter is. It ...