Large black scupper assembly

Product Description:

Upgrade your boat’s drainage system with our Innovative Scupper Flapper Assembly, purpose-built to prevent backflow and enhance drainage in harsh marine environments. Designed for boats with thru-hull fittings up to 2" ID, this assembly combines durability, flexibility, and reliability to deliver unmatched protection from water ingress.

The flexible flapper valve, top-hinged for responsive performance, opens easily to release water and automatically seals shut to block reentry—even under low backpressure, such as when reversing or backing down. This makes it an ideal solution for self-bailing cockpits and bilge systems.

Constructed from heavy-duty marine-grade nylon and flexible polymer, the trim ring holds the flapper in place even in demanding saltwater conditions. Proudly made in the USA, it stands up to UV exposure, corrosion, and mechanical wear.

Trusted by owners of vessels from Boston Whaler, Sea Hunt, Scout Boats, Grady-White, Key West, and other top boat builders, this marine scupper valve offers wide compatibility and reliable performance.

Install with ease using 4 #8 countersunk screws (not included). Whether you’re upgrading your drainage or replacing an old unit, this assembly provides a secure, maintenance-free solution for years to come.

Product Specifications:

• Overall Outside Diameter: 3-1/4"

• Inside Diameter of Trim Ring: 2-1/4"

• Flapper Outside Diameter: 2-1/8"

• Mounting Hole Spacing: 1-15/16" center-to-center

• Fits Thru-Hull Fittings Up To: 2" inside diameter

• Material: Marine-grade nylon trim ring with flexible flapper

• Mounting Screws: 4 #8 countersunk (not included)

• Country of Origin: USA