Sea-Dog Garboard Drain and Plug 520040-1, 2 Inch Machined Bronze, 1/2 Inch NPT

The Sea-Dog Garboard Drain and Plug (520040-1) is a traditional-style bronze drain fitting designed for mounting through the transom or hull garboard area to let water drain from the bilge when the boat is out of the water. It is machined from bronze for corrosion resistance in a marine environment and features a 2 inch diameter body with a 1/2 inch NPT thread size, allowing it to thread into a matching garboard drain fitting or hull opening. The plug is installed and removed with a standard #8 flat head (FH) fastener, which secures the plug in place while the boat is underway and allows it to be backed out for draining. This is a single-piece plug and body assembly, sold as one item, and is intended for boaters who need a reliable, low-maintenance drain point for bilge water removal during storage or trailering.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 520040-1
• Material: Machined Bronze
• Diameter: 2 inches
• Thread Size: 1/2 inch NPT
• Fastener Type: #8 FH (fastener not included)
• Color/Finish: As Shown
• Weight: 0.29 pounds
• Number of Items: 1

Fitment

This is a universal-fit garboard drain and plug intended for hulls with a 2 inch diameter, 1/2 inch NPT garboard drain opening; it is not tied to a specific boat make or model.

Frequently Asked Questions

What is the Sea-Dog 520040-1 Garboard Drain and Plug used for? It is a bronze drain fitting that threads into the garboard area of the hull, letting bilge water drain out when the boat is stored or trailered, and sealing the opening with the plug when underway.

What size is the Sea-Dog garboard drain 520040-1? The body diameter is 2 inches, with a 1/2 inch NPT thread size for installation into a matching drain opening.

What material is the 520040-1 garboard drain and plug made from? It is machined from bronze, chosen for its corrosion resistance in saltwater and freshwater marine environments.

Does the Sea-Dog 520040-1 come with mounting fasteners? No, the fastener is not included; the plug uses a #8 FH (flat head) fastener that must be sourced separately.

How much does the Sea-Dog garboard drain and plug weigh? The Sea-Dog 520040-1 weighs 0.29 pounds.

Is the 520040-1 sold as a single unit? Yes, it is sold as one complete drain and plug assembly, with a quantity of 1 item per unit.

Is this garboard drain plug specific to one boat brand or model? No, the Sea-Dog 520040-1 is a universal-fit fitting sized for a 2 inch, 1/2 inch NPT garboard drain opening rather than a specific boat make or model.

What thread type does the 520040-1 garboard plug use? It uses a 1/2 inch NPT (National Pipe Taper) thread for installation into the drain body.

Can the plug on the Sea-Dog 520040-1 be removed for draining and reinstalled? Yes, the bronze plug is designed to be threaded out to allow bilge water to drain and reinstalled to seal the opening when the boat is in the water.

What finish does the Sea-Dog garboard drain 520040-1 have? It has an as-shown bronze finish, consistent with the machined bronze construction of the part.