NEW! Quick Pressure - PSI-36 Tire Pressure Monitor Caps (4 units/pack) - Black Polycarbonate TPMS alternative. ALL GREEN: Properly inflated | PART RED/PART GREEN: Approximately 10% underinflated | ALL RED: Approximately 25% underinflated, ADD AIR ASAP! NO Leakage, Breakage, Cross-threading, Shrinkage / Expansion, or Chemical Reaction (to valve stem). Patented, designed, assembled and tested in the USA. Available for PSI 30, 32, 36, and 40. After installation, DRIVE YOUR VEHICLE for 10 miles or more. The tire rotation primes the pressure monitors to accurately display tire pressure status in the clear window. No tool needed when installing. Hand tighten only. Save gas, save tires, safer drive. Provide one year warranty!