Diesel Engine Driven Portable Screw Air Compressors from USA, Sullair has been continuously researching and developing towed screw air compressors since 1965 to provide Resistant to all conditions, easy to use, low maintenance costs. Highest operational reliability Designed to meet all the needs of the industry. With advanced manufacturing technology, Sullair guarantees the screw assembly for towing air compressors for 5 years or 10,000 hours.