The A100 Absorber has an optional bypass valve for fast CO2 build up when required and allows a canister change during ventilation. These absorbers are available in a single or double canister (1.3kg each) and are autoclavable. A100s have an optional bag/ventilator valve so it is easy to change from ventilator to bag. PEEP valves are optional, the expiratory valve mounted 0-20cm H2O PEEP valve.