Tugboats are specialized engineering vessels used for towing, pushing, berthing assistance, rescue, and auxiliary operations for ships, barges, and platforms in ports, inland rivers, coastal, and offshore areas, covering port terminals, inland waterways, coastal anchorages, and offshore operation waters; Major vessel types include harbor tugs, azimuth stern drive (ASD) tugs, offshore tugs, ocean-going tugs, and salvage tugs, with primary power requirements ranging from 800 kW to 6000 kW. Weichai's compatible engine models include the M series, WH25, and WH28, with fuel types primarily being diesel.