Expiratory valve tube | Expiratory valve control |
2
| P |
| 1 |
3 | 2 |
Pressure line tube
3
Pressure line
P 
(Prox. P.)
Figure 9: Connecting a single circuit with expiratory valve and pressure line
Once your circuit is connected to the device, you can connect the mask to the other end of the circuit.
Option 3 – Double circuit
1.Firmly connect one limb of the circuit to the air outlet 
.
2.Then connect the other limb 
.
| Symbol | |
Symbol | identifying | |
air outlet | ||
identifying | ||
| ||
air return | 1 | |
|
2 |
Figure 10: Connecting a double circuit
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