An inhaler for inhalation to the airways of a user, in which the inhaler (10) has: a housing (12) that at least partially defines a flow conduit (36) that extends through the inhaler from an inlet of air at an outlet； a measured dose cartridge (30) located in the housing, in which the cartridge (30) is movable in the housing (12) in response to manual operation； and a housing apparatus (70) having one or more valves (98) for selectively restricting the flow of air through the airflow conduit (36) of the inhaler (10), in which the apparatus (70) of housing comprises a head part (82) formed at least partially of deformable material and the valve (98) comprises at least one sealing opening that is deformable between a closed configuration and an open configuration, in response to manual operation, in the that the sealing opening comprises an elongated sealing groove formed in a side wall (96) of the head part (82)； and wherein the valve (98) of the housing apparatus (70) and the cartridge (30) are arranged for a coordinated opening of the valve (98) and the firing of a measured dose from the cartridge (30), in response to manual operation, in which the inhaler is characterized in that: the housing apparatus (70) is a housing cover apparatus (70)； and the head part (82) of the housing cover apparatus (70) has a coupling part arranged to couple, move and shoot the measured dose cartridge (30).Un inhalador para inhalación a las vías respiratorias de un usuario, en el que el inhalador (10) tiene: una carcasa (12) que define al menos parcialmente un conducto (36) de flujo que se extiende a través del inhalador desde una entrada de aire a una salida； un cartucho (30) de dosis medida situado en la carcasa, en el que el cartucho (30) es móvil en la carcasa (12) en respuesta a una operación manual； y un aparato (70) de carcasa que tiene una o más válvulas (98) para restringir selectivamente el flujo de aire a través del conducto (36) de flujo de aire del inhalador (10), en el q
