AC Spólka Akcyjna manufactures and sells LPG and CNG autogas systems under the STAG brand for petrol and diesel engines in Poland. It offers mobile applications; LPG/CNG controllers for Q-GENRATION, direct petrol injection, diesel, and economic lines; LPG/CNG injection rails; LPG and CNG reducers; fuel injector, level, and pressure emulator products; switches; fuel level indicators; timing advance processors; pressure sensors; interfaces; filters; and values. The company also provides auto parts, such as fuses, fuse holders, hose clamps, cable ties, terminals, connectors, rotating beacons, horns, plugs and sockets, trailer cables, adapters, spiral coils, car electronics, electrotechnics, tachograph accessories, and various other accessories; and leak testers and antifreeze products under the Tytangas brand. In addition, it exports its products. AC Spólka Akcyjna was founded in 1986 and is based in Bialystok, Poland.