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Unique tire valve caps with color-coded pressure indicator rings let you see when it's time to add air. Save gas, reduce tire wear and drive safer with your tires filled to the correct pressure. Simple to use. Just remove your present caps and replace with indicator caps. No more searching for tire gauges. One glance and you know whether you need air. Green means tire pressure is good, yellow means pressure is down at least 4 p.s.i., red means pressure is down at least 8 p.s.i. Studies show that 6 p.s.i. underinflation reduces tire life expectancy by 25% and gas mileage by 10% or more. Set of 4. For passenger cars (28-34 p.s.i.). Click here for more information and price |