Hub covering for a tyre filling device of a vehicle

A hub covering for a tire filling device of a vehicle for covering a vehicle wheel hub (1) rotatable on a center line, wherein an air supply coupled to a steering knuckle (21) arranged inside the vehicle wheel hub (1) is connected at least indirectly via a rotary connection (3) arranged on the hub covering (2) to an air volume in a tire of a vehicle wheel, wherein the rotary connection (3) comprises an adapter (4) arranged in an axially secured and rotatable manner on the hub covering (2) and accommodating a rotary transmitter (5) for producing a compressed air connection to the tire of the vehicle wheel, wherein the adapter (4) comprises a flow connection (8) extending between an inner side of the adapter (4) facing the vehicle wheel hub (1) and an end side of the adapter (4) facing away from the vehicle wheel hub (1), wherein the flow connection (8) of the adapter (4) comprises a first encircling groove (22), wherein the first encircling groove (22) is formed in the end side of the adapter (4) and opens axially in a direction away from the vehicle wheel hub (1), and wherein the first encircling groove (22) encircles the center line (A) and accommodates a radial shaft sealing ring (23).