... FS0852 Low Tire Pressure Alert Cap 2.low tire pressure alert cap alerts the driver by a blinking LED whenever the tire pressure falls 5- ... produce less CO2 pollution4.installation: just tighten the low tire pressure alert cap onto valve stem bu finger,no tool ... , Van,Trailer,Bus,Truck,Motorcycle,Bicycle The tire pressure warning cap support all tire pressures between 20psi and 130psi.Detail picture of ...