The utility model discloses a general air cock of inflater, including the air cock shell with set up the plunger tip in the air cock shell, be provided with axial through's the air flue of ventilating on the plunger tip, the front end of air cock shell is provided with the sealing washer, the plunger tip passes the sealing washer, characteristics are air cock shells with the plunger tip between be provided with the connection shifter that can be connected with different grade type cranked tire valve that need not the manual switching operation, be provided with plunger tip anti -disengaging mechanism between air cock shell and the plunger tip, the advantage is that this general air cock is when using, and it is fixed through threaded connection between the cranked tire valve, tightening force degree to the cranked tire valve is good, and owing to be provided with the connection shifter that can be connected with different grade type cranked tire valve that need not the manual switching operation between air cock shell and the plunger tip, regardless of aerifing to american cranked tire valve or to the french cranked tire valve, if all will this general air cock and two kinds of cranked tire valves peg graft rotatory the screwing up in back can, operation is unchangeable, in using, need not to operate the suggestion to the user, its is easy and simple to handle, simple structure.