The disclosed technology relates to a connection ring (100) for removable attachment of a fuel supply unit (300) on a fuel tank (210). The connection ring comprises a ring upper side (110), at least one attachment elevation (130) which protrudes from the ring upper side (110), and at least one tool engagement region (140). The tool engagement region (140) is constructed such that a torque from a tool can be transmitted onto the connection ring (100). At least one portion of the tool engagement region (140) and one portion of the attachment elevation (130) are at an equal distance from the centre M of the connection ring (100) in the radial direction R from the centre M.