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2.  Turn the black plug counterclockwise to take it out of the housing. And then turn the O2 
sensor counterclockwise to take it out of the threaded cup. 
   
 
9.4.2 Remove Breathing Tubes 
NOTE 
  When disassembling the breathing tube, hold the tube connectors at both ends of 
the tube to prevent damage to the tube. 
1.  Remove the filter from the Y piece. 
 
2.  Disconnect the breathing tubes from the inspiration/expiration connectors on the circuit.