Harbor Island Supply

Based in Seattle, Harbor Island Supply is a family-owned casting facility that manufactures and distributes zinc, aluminum, and magnesium anodes for cathodic protection. It produces anodes for vessels and structures, with products for commercial use and pleasure craft in different types of water. Custom casting is available through an in-house machine shop, which can create molds for special orders, modify existing designs, or develop a new design for a specific application. Production runs can be large or small. The company uses high-purity metals and controlled alloy additives, and produces anodes to current military specifications. Many products are kept in stock, while others are made to order. Orders are shipped through a variety of shipping partners, and staff can help customers identify a suitable anode for their needs.