4 Unit Tyre Monitor Valve Stem Cap Warning Air Pressure 2.4Bar for Automobile Van Lorry   

Usage Instructions

Green indicatoes that tyre pressure is normal.
Yellow indicates that the pressure is down about 5 pounds.
Red alerts users that the pressure is down by at least 10 pounds.

Installation:

Predefine the correct tire pressure for the tires.

Inflate tire to correct pressure.
Fix the pressure cap tightly.
Simply watch the color and confirm if the tire is low or normal

Package:

4 units of Tire Pressure Indicator Valve Stem Caps