Generally speaking, the life of the tire valve is 3-4 years, which is not much different from the service life of the tire. Therefore, it is recommended to replace the rubber valve together when changing the tire. If the rubber valve becomes dark red or the color is changed by hand, it means that the valve has been aging seriously and can not play the sealing role on the tire. It is easy to leak or burst the tire if it is still used, and it should be replaced in time.