Features: 

the unit is made of metal, durable and Lasting.
with Airway pressure gauge-display airway pressure in real time.
with APL Valve on the circle absorber, perform pressure limits Protection.  
with international standard connectors for inspiration, expiration, etc.
with Manual / Ventilation switch.
the canister is made of Polycarbonate, 6 Bolts for fixing. 

Specifications:

Material:	High quality metal
Valve flake:	Ceramics
Airway pressure gauge:	-2 --10 kPa
the volume of canister:	900ml about
Safety valve pressure limit:	6 kPa