Simplifies finding the correct through-hull fitment with Sea-Dog Stainless Steel Exhaust Through Hull 3" (521125). An exhaust thru-hull with a rubber seal on the stainless steel flap allows water to enter or exit a vessel through the hose. These thru-hulls are made from injection-molded nylon resistant to electrolysis and corrosion, making them perfect for usage in salt water. Ideally suited for use in areas above the water table. Boat exhaust thru-hull from Sea Dog is committed to providing boat builders and owners with innovative, high-quality products and services that will help them achieve their goals today and in the future. Key Features: Marine-grade stainless steel flap with a rubber seal. 316 Stainless steel construction and resistant to corrosion Conforming to strict quality standards Designed for use with 2 1/2-inch or 3-inch ID hose Includes Mounting plate, Thru-hull, and fasteners Specifications: Brand: Sea Dog Marine SKU: 3-521125 UPC: 035514521857 Weight: 1.87 LBS Unit of Measure: EA Manufacturer Part Number (MPN): 521125 Material: Stainless Steel Diameter: 2-9/16" Hose Size: 2-1/2" Condition: New Cast 316 Stainless Steel The Exhaust Thru-Hull features a stainless flap with a rubber seal. Designed for use with 2-1/2" or 3" ID hose. Constructed of corrosion resistant investment cast 316 stainless steel. Includes mounting plate and fasteners.