Accu-Pressure Safety Tire Caps, Set of 4 (32 psi)

I bought these for several cars and encouraged friends to get them before I had experience with them. (Foolish.)

They simply do not work. You can get your pressure far below their set pressure and they will continue to show no problem.

Totally unreliable. Plus, since you are driving around with your valve stem pin pushed in, if these things develop a leak themselves, you lose tire pressure.

I think they are dangerous.

Sorry to say that these caps do not work! I had thought by seeing green the tires were fine when all the time they were losing air! To back my claim an ASC certified mechanic said that these caps were a waste of money. They simply give you a false sense of confidence.

I think this product is a great idea. It's an inexpensive and quick visual method to see if your tires are getting low on pressure.

I rated these two stars because the quality is not good.

I had a slow leak that went on for several weeks in one tire. I kept checking the tire and checking it again to see how it was that it was low on air. I was about to take a trip to the tire store to have them remove the tire and test it when I got the idea to remove my (fairly) new tire pressure cap monitor to see if that was the problem. Sure enough, the device had separated between the metal stem and the plastic top (where the color coded top is) and it had been slowly leaking for several weeks.

For this reason I would pass on recommending these devices.