Stainless Steel Drain Plug – Ø25.4 mm (1″)

This stainless steel drain plug offers a top-tier solution for boat drainage where reliability and longevity are paramount. The 25.4 mm diameter (approximately 1 inch) is a standard for many larger boats and yachts, making this plug compatible with existing drain holes or convenient for drilling a new hole using a common template. AISI 316 stainless steel – known for its superior corrosion resistance – ensures that neither saltwater nor UV exposure will compromise the plug’s integrity or appearance. The polished finish gives it a professional look that blends in well with the boat’s exterior.

The set includes a flat flange base and a separate threaded plug. Installation involves attaching the flange to the transom with two or more screws (preferably stainless steel screws to maintain corrosion resistance). The flange sits flush against the hull; applying a marine sealant (silicone or polyurethane) underneath before screwing it down is recommended for additional waterproofing. The plug itself screws into the center of the base – it has a wide head that can be tightened by hand or with a tool if needed (for example, a flat screwdriver or a dedicated key, depending on the design).

Advantages: A stainless plug outperforms plastic alternatives in strength and durability. It won’t crack or warp under extreme temperatures or if accidentally struck. For boats that remain in the water continuously (at a dock or marina), a metal plug provides better long-term defense against leaks. Likewise, if your boat operates in saltwater environments, this plug will endure for years without rust, unlike lower-grade metals.

Recommended use: Suitable for medium to large vessels – for instance, cruising sailboats, motor yachts, and high-end RIBs. It is often used as a garboard drain plug (the drain at the lowest point of the hull), where durability is critical. The 1″ diameter allows a quick discharge of significant water volume – useful during heavy rain or when pulling the boat onto a trailer and you want the bilge to empty fast.

For operation, ensure the plug’s O-ring is clean and intact; this is key to maintaining a watertight seal. Screw the plug in firmly but avoid over-tightening – the rubber will compress to seal the opening. When you need to drain, unscrew the plug (for example, using a coin or screwdriver if it has a slot) and let the water flow out. Thanks to the high-quality materials, maintenance is minimal – simply rinse the assembly with fresh water occasionally and inspect the gasket annually. This stainless drain plug is an investment in your boat’s safety and reliability.