New valve caps monitor your tyre pressure Incorrect pressure can be dangerous as well as wearing out your tyres too quickly, but most of us are lax about checking them regularly. Now Ultraseal have introduced these new tyre pressure monitors, which simply replace your existing valve caps. If tyre pressure is low, the monitor will show yellow for caution or red for danger. Made of strong, chrome-plated steel, each cap is individually tested before sale. Available in pairs in the following PSIs: 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 45, 46, 48, 50, 52, 54, 55, 56, 58, 60, 65, 70, 75, 80. Please don't forget of specifying PSI when ordering