While they usually go unnoticed until you lose one, tire valve caps do serve an important purpose. But are they universal, ...

Tyre valves control the airflow in and out of your car tyres, ensuring proper performance. To protect these valves, dust caps (also known as valve caps) are fitted over their ends.

The RightPSI cap is a tyre pressure indicator that screws directly onto your tyre valve connection and has been colour-coded to indicate when you tyre pressure is correct, low or overfilled.

RightPSI's pressure indicator is visible from 20 feet away, the company says: The cap starts out black, turns orange when pressure is low, and yellow when a tire is overfilled.