AC. 

AC Spólka Akcyjna, founded in 1986 and based in Bialystok, Poland, is a leading manufacturer and distributor of automotive systems and components. The company's primary focus is on developing and selling advanced LPG and CNG autogas conversion kits, marketed under its reputable STAG brand. These sophisticated systems are engineered to allow both petrol and diesel engines to operate on alternative fuels, with offerings tailored for various applications including direct petrol injection and diesel conversions. The extensive STAG product lineup features a broad range of specialized parts, such as intuitive mobile applications for system management, various LPG/CNG controllers (including Q-GENERATION, direct injection, and diesel models), fuel injection rails, durable LPG and CNG reducers, and emulator products for fuel injectors, levels, and pressure. Essential supporting components like switches, fuel level indicators, timing advance processors, pressure sensors, interfaces, filters, and valves are also part of their portfolio. Beyond its core autogas technology, AC S.A. supplies a comprehensive array of general automotive parts. This includes a wide selection of electrical components (fuses, fuse holders, terminals, connectors, plugs, sockets), wiring accessories (hose clamps, cable ties), warning devices (rotating beacons, horns), and trailer equipment (cables, adapters, spiral coils). The company also offers car electronics, electrotechnical products, and tachograph accessories. Furthermore, under its Tytangas brand, it provides leak detection tools and antifreeze solutions. AC Spólka Akcyjna maintains an international presence, actively exporting its products in addition to serving the Polish market.