Seaway Manufacturing Corporation is a privately held, woman- and family-owned manufacturing company in Erie, Pennsylvania spe ... cializing in windows, doors, and sunrooms. Founded in 1959, Seaway has become well-known as an industry leader across all of its product lines. Seaway is proud to design and manufacture products that minimize maintenance and improve a home’s appearance, energy efficiency, and investment value. Our lines of premium vinyl replacement windows, patio doors, and sunrooms are sold to homeowners across the eastern and central United States through a network of authorized Seaway dealers. To learn more about becoming an authorized Seaway dealer or to locate a dealer in your area visit our website at seawaymfg.com. read more