A dispensing device comprising: - a bottle provided with a neck having a neck axis (X), 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 (Z) coinciding with the neck axis (X) and a dispensing tube having at least a first section extending along a secondary axis (W) parallel to and spaced from the main axis (Z), 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 (X), 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 (Z) coinciding with the neck axis (X) and a dispensing tube having at least a first section extending along a secondary axis (W) parallel to and spaced from the main axis (Z), 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 (Z) coinciding with the neck axis (X) and a dispensing tube having at least a first section extending along a secondary axis (W) parallel to and spaced from the main axis (Z), 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. <EOS>