THE PRESSURE AIR CHARGING ELEMENTS OFFERED IN THIS E-STORE ARE ADAPTED TO THE EUROPEAN DIN REGULATIONS. DO NOT USE CONNECTORS AND/OR CONVERTERS OF ORIENTAL MANUFACTURE (Chinese, Korean, etc.) THEY ARE NOT ADAPTED TO EUROPEAN MEASUREMENTS AND THEY USUALLY GIVE MANY PROBLEMS BECAUSE THE MEASUREMENTS ARE NOT VALID AND THE THREADS ARE NOT THE SAME. IN GENERAL, CONNECTORS NOT ADAPTED TO THE EUROPEAN DIN SYSTEM DO NOT WORK CORRECTLY.