This item converts filters with a 40mm thread to fit any gas mask with a 60mm opening.
Genuine British Army Gas Mask Filter Adapter 40mm TO 60mm Thread Adapter
GAS MASK FILTER FP-5 POLISH ARMY 40 MM STANDARD NATO-NEW.
Gas Mask Filter - 40mm Nato, Black Metal, New & Sealed
NATO GAS MASK FILTER ADAPTORS 40mm to 3M / 40mm blanking plug/ 60mm-40mm / Scott
Used Avon Protection Gas Mask Filter 72604 FM12 C50 SAS BRITISH ARMY AVF01U
FM12 gas mask filter screw in speech emitter plug
