A quick connector includes a housing having a receiving chamber for receiving, in a fluid-tight manner, a connecting piece, the receiving chamber transitioning into a line portion for conveying a fluid. A sealing chamber, which surrounds at least parts of the circumference of the receiving chamber and has at least one sealing ring arranged in the sealing chamber. A closure unit for locking the at least one sealing ring in the sealing chamber. The closure unit includes a sleeve, which delimits at least parts of the sealing chamber and has at least one arm extending from the sleeve, which arm is designed to lock the closure unit on the housing.