A conduit connector assembly for a respiratory therapy apparatus and configured to connect a patient interface to a gas delivery conduit, the conduit connector assembly comprising: a conduit comprising a first flow port configured to be connected to the patient interface, a second flow port configured to be connected to the gas delivery conduit, and a supplementary flow port; a hollow valve body (1017; 2017) configured to be mounted on or in the conduit and comprising a first valve port (1019; 2019), a second valve port (1021; 2021), and a supplementary valve port (1023; 2023), wherein the first valve port (1019; 2019) is in communication with the interior of the conduit, the second valve port (1021; 2021) is in communication with the first valve port (1019; 2019) and the supplementary flow port, and the supplementary valve port (1023; 2023) is between the first valve port (1019; 2019) and the second valve port (1021; 2021); and a valve flap configured to move between a first position in which the valve flap at least partially blocks the first valve port (1019; 2019), and a second position in which the valve flap at least partially blocks the gas delivery conduit; wherein the conduit, the valve body (1017; 2017) and the valve flap are configured to selectively provide two flow paths through the conduit, being: a first flow path from the second flow port of the conduit to the first flow port of the conduit; a second flow path from the first flow port of the conduit to the supplementary flow port via the first valve port (1019; 2019) of the valve body (1017; 2017); wherein a supplementary gas flow path is provided between the first and/or second flow ports (1003, 1007) and the supplementary flow port via the supplementary valve port (1023; 2023) of the valve body (1017; 2017), and the valve body (1017; 2017) and/or conduit is configured such that the supplementary gas flow path is permanently open. a conduit comprising a first flow port configured to be connected to the patient interface, a second flow port configured to be connected to the gas delivery conduit, and a supplementary flow port; a hollow valve body (1017; 2017) configured to be mounted on or in the conduit and comprising a first valve port (1019; 2019), a second valve port (1021; 2021), and a supplementary valve port (1023; 2023), wherein the first valve port (1019; 2019) is in communication with the interior of the conduit, the second valve port (1021; 2021) is in communication with the first valve port (1019; 2019) and the supplementary flow port, and the supplementary valve port (1023; 2023) is between the first valve port (1019; 2019) and the second valve port (1021; 2021); and a valve flap configured to move between a first position in which the valve flap at least partially blocks the first valve port (1019; 2019), and a second position in which the valve flap at least partially blocks the gas delivery conduit; wherein the conduit, the valve body (1017; 2017) and the valve flap are configured to selectively provide two flow paths through the conduit, being: a first flow path from the second flow port of the conduit to the first flow port of the conduit; a second flow path from the first flow port of the conduit to the supplementary flow port via the first valve port (1019; 2019) of the valve body (1017; 2017); wherein a supplementary gas flow path is provided between the first and/or second flow ports (1003, 1007) and the supplementary flow port via the supplementary valve port (1023; 2023) of the valve body (1017; 2017), and the valve body (1017; 2017) and/or conduit is configured such that the supplementary gas flow path is permanently open. a first flow path from the second flow port of the conduit to the first flow port of the conduit; a second flow path from the first flow port of the conduit to the supplementary flow port via the first valve port (1019; 2019) of the valve body (1017; 2017); wherein a supplementary gas flow path is provided between the first and/or second flow ports (1003, 1007) and the supplementary flow port via the supplementary valve port (1023; 2023) of the valve body (1017; 2017), and the valve body (1017; 2017) and/or conduit is configured such that the supplementary gas flow path is permanently open.