Powerwinch Saltwater Series Jack - 2500lb, Weld-On, Flat Plate, Zinc 500+ HR Salt Spray [21600-J-2500-WF-Z-R]Saltwater Series Jack 2500lb, Weld On, Flat Plate, Zinc 500+ HR Salt Spray The Saltwater Series Trailer Jacks are designed for marine applications where exposure to saltwater and corrosive conditions is common. These jacks feature a 500 hour salt sprayrated zinc plated coating that provides enhanced corrosion resistance compared to standard finishes. Like the Select Series, Saltwater Series jacks include a pivot pin sleeve for dependable pivot