A valve for connecting a respiration circuit to a humidifier chamber, wherein the valve is configured to control a flow of fluid through the valve, the valve comprising: a conduit; a first valve portion disposed at a first end of the conduit, the first valve portion having an inlet configured to interface with a respiration circuit, a first humidifier interface configured to be removably connected to a humidifier chamber, and a first conduit opening in fluid communication with an interior of the conduit, the first valve portion being configured to define a switchable flow path between the inlet and either the first humidifier interface or the first conduit opening; a second valve portion disposed at a second end of the conduit, the second valve portion having an outlet configured to interface with a respiration circuit, a second humidifier interface configured to be removably connected to the humidifier chamber, and a second conduit opening in fluid communication with the interior of the conduit, the second valve portion being configured to define a switchable flow path between the outlet and either the second humidifier interface or the second conduit opening; wherein the first valve portion and the second valve portion are configured such that: responsive to the first humidifier interface and/or the second humidifier interface being connected to the humidifier chamber, a flow path is formed from the inlet to the outlet through the humidifier chamber, and responsive to the first humidifier interface and the second humidifier interface being disconnected from the humidifier chamber, a flow path is formed from the inlet to the outlet through the conduit. a conduit; a first valve portion disposed at a first end of the conduit, the first valve portion having an inlet configured to interface with a respiration circuit, a first humidifier interface configured to be removably connected to a humidifier chamber, and a first conduit opening in fluid communication with an interior of the conduit, the first valve portion being configured to define a switchable flow path between the inlet and either the first humidifier interface or the first conduit opening; a second valve portion disposed at a second end of the conduit, the second valve portion having an outlet configured to interface with a respiration circuit, a second humidifier interface configured to be removably connected to the humidifier chamber, and a second conduit opening in fluid communication with the interior of the conduit, the second valve portion being configured to define a switchable flow path between the outlet and either the second humidifier interface or the second conduit opening; wherein the first valve portion and the second valve portion are configured such that: responsive to the first humidifier interface and/or the second humidifier interface being connected to the humidifier chamber, a flow path is formed from the inlet to the outlet through the humidifier chamber, and responsive to the first humidifier interface and the second humidifier interface being disconnected from the humidifier chamber, a flow path is formed from the inlet to the outlet through the conduit. responsive to the first humidifier interface and/or the second humidifier interface being connected to the humidifier chamber, a flow path is formed from the inlet to the outlet through the humidifier chamber, and responsive to the first humidifier interface and the second humidifier interface being disconnected from the humidifier chamber, a flow path is formed from the inlet to the outlet through the conduit.