1.Low Tire Pressure Alert Cap 2.fit for car,van,trailer,bus,truck, ... check here 1. FS0852 Low Tire Pressure Alert Cap 2.low tire pressure alert cap alerts the driver by a blinking ... less CO2 pollution4.installation: just tighten the low tire pressure alert cap onto valve stem bu finger,no tool required.5 ... .the alert cap can be re-calibrated6.how it work: The ...