The annular sealing cup with axis Δ, a so-called replenishment cup, which is intended to be positioned between a hydraulic cylinder and piston and which has a <<U>> axial section and has application to braking circuits comprises:a static branch (10) defining a static sealing annular lip,a dynamic branch (12) defining a dynamic sealing annular lip,and a core (14) connecting the static (10) and dynamic (12) branches and defining a annular bead (15) opposite the lips.