- GREEN: Indicates tire is at proper inflation
- YELLOW: Indicates tire is approximately 4 lbs low.
- RED: Indicates tire is approximately 10 lbs low.
- Sold in a two-pack... perfect for Motorcycles
These caps didn't work. They were always green, even though the tire gauge showed the tires were significantly under-inflated (like 10-12 psi under inflated one time). Same result on both cars I tried them on. I returned them (didn't buy on Amazon). What a scam.
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I purchased these caps (not from Amazon.com) for both of our cars. One cap fails to go green regardless how much air is in the tire. Another one, worked for a few months and then one day leaked all the air out of the tire. Upon carefully evaluation of the cap, you'll find that the clear plastic has a "plug" right in the middle of each cap. Under pressure, that "plug" can pop off and become a spot where the air is leaked out. Thank goodness, we had run-flat tires and was able to drive home. I am now looking for alternative makes of these tire pressure indicator valves.
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