A dispensing device comprising: - a bottle provided with a neck having a neck axis, wherein said neck delimits internally a neck compartment; - a trigger dispensing head applied to the neck of said bottle in a separable manner, wherein the dispensing device is characterized by the fact that said trigger dispensing head comprises: a) a socket at least partially housed in the neck compartment; b) a main body comprising a cylinder extending along a main axis coinciding with the neck axis and a dispensing tube having at least a first section extending along a secondary axis parallel to and spaced from the main axis, wherein said main body is at least partially inserted in the socket, thereby delimiting, in the portion contained in the neck compartment of said socket, a valve compartment; c) a valve group comprising a pre-compression valve, which allows the passage of the product to be dispensed when the pressure in the dosing chamber exceeds a predefined threshold pressure, and a check valve, the valve group housed in said valve compartment of the socket; d) a sealably sliding piston in said cylinder; e) a trigger group engaged with the piston, comprising a trigger for actuating the device; f) elastic return means engaged with the trigger or with the piston, operating permanently to bring the device to the initial resting configuration. - a bottle provided with a neck having a neck axis, wherein said neck delimits internally a neck compartment; - a trigger dispensing head applied to the neck of said bottle in a separable manner, wherein the dispensing device is characterized by the fact that said trigger dispensing head comprises: a) a socket at least partially housed in the neck compartment; b) a main body comprising a cylinder extending along a main axis coinciding with the neck axis and a dispensing tube having at least a first section extending along a secondary axis parallel to and spaced from the main axis, wherein said main body is at least partially inserted in the socket, thereby delimiting, in the portion contained in the neck compartment of said socket, a valve compartment; c) a valve group comprising a pre-compression valve, which allows the passage of the product to be dispensed when the pressure in the dosing chamber exceeds a predefined threshold pressure, and a check valve, the valve group housed in said valve compartment of the socket; d) a sealably sliding piston in said cylinder; e) a trigger group engaged with the piston, comprising a trigger for actuating the device; f) elastic return means engaged with the trigger or with the piston, operating permanently to bring the device to the initial resting configuration. a) a socket at least partially housed in the neck compartment; b) a main body comprising a cylinder extending along a main axis coinciding with the neck axis and a dispensing tube having at least a first section extending along a secondary axis parallel to and spaced from the main axis, wherein said main body is at least partially inserted in the socket, thereby delimiting, in the portion contained in the neck compartment of said socket, a valve compartment; c) a valve group comprising a pre-compression valve, which allows the passage of the product to be dispensed when the pressure in the dosing chamber exceeds a predefined threshold pressure, and a check valve, the valve group housed in said valve compartment of the socket; d) a sealably sliding piston in said cylinder; e) a trigger group engaged with the piston, comprising a trigger for actuating the device; f) elastic return means engaged with the trigger or with the piston, operating permanently to bring the device to the initial resting configuration.