Donaldson Filtration Solutions for Tugs, OSV, Crew/Supply Ships,Trawlers & Stevedoring: We offer air intake, lube, coolant and transmission filters for a range of marine engines, z-drives, generators and compressors. We also offer a range of hydraulic filters and accessories for a variety of marine and stevedore equipment. Our bulk fuel and lubrication filtration products remove contaminants and control moisture in bulk supply tanks prior to pumping fluids into equipment so the on-board filtration systems do their job better. Donaldson can design a system that is a powerful first line of defense in protecting your equipment.