Fluid product reservoir and dispenser

A fluid product reservoir comprising a container defining a collar and a mounting part mounted on the collar, the mounting part forming a basket disposed at the collar and a dip tube which extends from the basket into the container, the dip tube being initially blocked by a sealing member, the fluid product reservoir further comprising an insert disposed in the basket, the insert comprising a piercing element, at least a portion of the piercing element configured to move inside the basket between an initial position wherein the sealing member blocks flow of the fluid product in the dip tube and a final position wherein the piercing element is moved in a state piercing the sealing member,

• wherein the insert is housed inside the basket and comprises a cuff forming a receiving housing for the fitting of an inlet sleeve of a dispensing member, the cuff being integral in movement with the piercing element.