A two-way check valve for a breathing gas supply assembly, comprises a body, a first inlet in the body for receiving a normal breathing gas flow, an outlet for delivering a gas flow from the body, first passage means communicating the first inlet with the outlet, second passage means communicating the second inlet with the outlet, a valve member mounted internally of the body so as to be movable between a first position in which it closes communication between the second inlet and the outlet and a second position in which it closes communication between the first inlet and the outlet, and resilient means biasing the valve member towards the first position.
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