This item converts filters with a 40mm thread to fit any gas mask with a 60mm opening.
Genuine Gas Mask Filter / Canister 40mm Thread - NEW
Genuine British Army Gas Mask Filter Adapter 40mm TO 60mm Thread Adapter
GAS MASK FILTER FP-5 POLISH ARMY 40 MM STANDARD NATO-NEW.
NATO GAS MASK FILTER ADAPTORS 40mm to 3M / 40mm blanking plug/ 60mm-40mm / Scott
FM12 gas mask filter screw in speech emitter plug
GAS MASK FILTER MS-4 POLISH ARMY 40 MM STANDARD NATO-NEW.
