Schematic of the circuit assembly. Gas mixtures are supplied through the barbed inlet of the connector TM #1642. The elbow can be of two different types, with a luer-lock or barbed sampling port (TM #1624 or #1632 respectively). The limb reservoir is formed by two corrugated tubings (TM #1418) coupled by a connector (TM #1960), which is not represented here. The mask (IS #7193) comes with a support (not represented) allowing to attach the harness (TM# 15920).