Dispenser device for dispensing a liquid, comprising: - a container provided with a neck, suitable to contain the liquid to be dispensed, wherein the neck extends along a container axis, - a dispenser head attached to the neck of the container, comprising: a) a frame comprising; i) a pressure chamber in which a piston sealingly slides along a pressure axis, and a dispenser duct, in fluidic communication with the pressure chamber, to dispense a liquid to the outside; ii) a secondary liquid aspiration duct which can be connected to the pressure chamber; b) manual actuation devices operatively connected to the piston to move it in the pressure chamber; c) an auxiliary body attached to the frame comprising: i) a primary liquid aspiration duct connected to the compartment inside the container; ii) an air aspiration chamber connected to the compartment inside the container; wherein between the frame and the auxiliary body a merger compartment is formed communicating upstream with the primary liquid aspiration duct and communicating downstream with the secondary liquid aspiration duct to form the fluidic communication between these; and wherein the air aspiration chamber surrounds the merger compartment and is sealingly separated from it; characterised in that the head comprises: d) reinforcement means on the frame and counter reinforcement means on the auxiliary body suitable for reciprocally engaging yieldingly, wherein the reinforcement means comprise at least one reinforcement protrusion positioned inside the merger compartment, that is radially inside an inner lip, and wherein the counter reinforcement means comprise at least one seat made between protrusions projecting axially from the auxiliary body. - a container provided with a neck, suitable to contain the liquid to be dispensed, wherein the neck extends along a container axis, - a dispenser head attached to the neck of the container, comprising: a) a frame comprising; i) a pressure chamber in which a piston sealingly slides along a pressure axis, and a dispenser duct, in fluidic communication with the pressure chamber, to dispense a liquid to the outside; ii) a secondary liquid aspiration duct which can be connected to the pressure chamber; b) manual actuation devices operatively connected to the piston to move it in the pressure chamber; c) an auxiliary body attached to the frame comprising: i) a primary liquid aspiration duct connected to the compartment inside the container; ii) an air aspiration chamber connected to the compartment inside the container; wherein between the frame and the auxiliary body a merger compartment is formed communicating upstream with the primary liquid aspiration duct and communicating downstream with the secondary liquid aspiration duct to form the fluidic communication between these; and wherein the air aspiration chamber surrounds the merger compartment and is sealingly separated from it; characterised in that the head comprises: d) reinforcement means on the frame and counter reinforcement means on the auxiliary body suitable for reciprocally engaging yieldingly, wherein the reinforcement means comprise at least one reinforcement protrusion positioned inside the merger compartment, that is radially inside an inner lip, and wherein the counter reinforcement means comprise at least one seat made between protrusions projecting axially from the auxiliary body. a) a frame comprising; i) a pressure chamber in which a piston sealingly slides along a pressure axis, and a dispenser duct, in fluidic communication with the pressure chamber, to dispense a liquid to the outside; ii) a secondary liquid aspiration duct which can be connected to the pressure chamber; i) a pressure chamber in which a piston sealingly slides along a pressure axis, and a dispenser duct, in fluidic communication with the pressure chamber, to dispense a liquid to the outside; ii) a secondary liquid aspiration duct which can be connected to the pressure chamber; b) manual actuation devices operatively connected to the piston to move it in the pressure chamber; c) an auxiliary body attached to the frame comprising: i) a primary liquid aspiration duct connected to the compartment inside the container; ii) an air aspiration chamber connected to the compartment inside the container; wherein between the frame and the auxiliary body a merger compartment is formed communicating upstream with the primary liquid aspiration duct and communicating downstream with the secondary liquid aspiration duct to form the fluidic communication between these; and wherein the air aspiration chamber surrounds the merger compartment and is sealingly separated from it; characterised in that the head comprises: i) a primary liquid aspiration duct connected to the compartment inside the container; ii) an air aspiration chamber connected to the compartment inside the container; d) reinforcement means on the frame and counter reinforcement means on the auxiliary body suitable for reciprocally engaging yieldingly, wherein the reinforcement means comprise at least one reinforcement protrusion positioned inside the merger compartment, that is radially inside an inner lip, and wherein the counter reinforcement means comprise at least one seat made between protrusions projecting axially from the auxiliary body.