Connector (100) to automatically connect an inflation device to a valve, comprising a hollow stopper (8) to operate elements for opening the valve and an elastically deformable seal (3), characterised in that the seal has a lip (35) designed to:

• immobilize the stopper during inflation, if the aforementioned valve is of a first type; or
• deform to form a seal around the valve during inflation if the aforementioned valve is of a second type. This connector is particularly suitable for fitting to a bicycle pump.