Sea-Dog Line 521125 Exhaust Thru-Hull Fitting Cast 316 Stainless Steel

The Sea-Dog Line 521125 is a premium marine exhaust thru-hull fitting designed for reliable exhaust discharge through the hull of boats and marine vessels. Constructed from corrosion-resistant cast 316 stainless steel, this fitting provides exceptional durability in harsh saltwater environments.

Key Features:

• Cast 316 marine-grade stainless steel construction for maximum corrosion resistance
• Integrated stainless steel flap with rubber seal prevents water backflow
• Spring-loaded flap design ensures positive closing when exhaust is not flowing
• Rubber seal creates watertight barrier to keep water out of exhaust system
• Designed for through-hull exhaust applications on powerboats and sailboats
• Complete assembly includes flap mechanism and mounting hardware

This thru-hull exhaust fitting is ideal for wet exhaust systems where exhaust gases exit below the waterline. The flap valve automatically opens under exhaust pressure and closes when the engine shuts down, preventing water intrusion that could damage the engine. The premium 316 stainless steel construction ensures long-lasting performance even in the most demanding marine conditions.