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The Forsheda A4 is a civilian variant of the Forsheda F2.
The main differences between the two are that the A4 has only one accessible filter port, as the second is sealed, and that the A4 has no drinking tube. Can come with a hard piece of green plastic that is used to keep the rubber in the right shape during storage. This green plastic should be removed before use. This mask is very comfortable to wear and it gives a very good field of view.