Inside the distributor cap there are up to 30,000 Volts between the live parts. The spark discharge between the distributor rotor and the HT lead contacts generate heat and a high proportion of aggressive nitrogen oxides. Extreme demands are therefore made of the chemical resistance and tracking resistance of the distributor cap. Therefore always use Bosch distributor caps; tried and tested quality. Bosch supplied the worlds first high-voltage ignition system in 1902 and has long been known for premium quality European ignition parts. Bosch also offers an equally superior line of ignition products for Asian cars and light trucks. Long recognized as an industry leader in ignition and fuel systems, Boschs quality, innovation, and experience are the foundation of the entire line of engine management components.