Patent ID: 8770195

Claim:
A mouth piece for a breathing apparatus, said mouth piece comprising: a valve assembly including a valve trigger mechanism arranged to operatively open and close said valve assembly; a mouth piece housing comprising: a mouth piece breathing part opening structured to allow inhaling and exhaling a breathable gas by a user, an inlet port structured to allow breathable gas into said mouth piece housing, said inlet port being in communication with said valve assembly arranged to operatively open and close said inlet port, a first exit port structured to allow gas to exhaust from said housing into a closed circuit flow channel, and a second exit port structured to allow gas to exhaust from said housing into an ambient environment; and a switch assembly to selectively direct said exhaust gas between said first exit port and said second exit port, wherein said switch assembly is further arranged to adjust the opening and closing function of said valve trigger mechanism such that said valve trigger mechanism is activated by a first pressure threshold when said switch assembly is arranged to direct said exhaust gas to said first exit port and a second pressure threshold when said switch assembly is arranged to direct said exhaust gas to said second exit port.