Check of gates of tires

1. To unscrew a dustproof cap of the gate.
2. To moisten the gate with water or saliva. If bubbles are formed, to screw up the gate a reverse side of a dustproof cap.

It is possible to apply only a metal dustproof cap to tightening of the gate.

3. Again to check the gate. If bubbles are again formed, and the gate is not screwed up any more, to replace it.
4. To screw a dustproof cap always.