Stainless Steel Long 1 1/2" Threaded Scupper

Product Description

Upgrade your vessel with our Premium 316 Stainless Steel Thru Hull Scupper, proudly Made in the USA. This solid-cast marine-grade fitting delivers unmatched water backflow prevention, durable corrosion resistance, and a refined aesthetic finish that elevates both performance and style.

Featuring a built-in internal flapper, this scupper acts as a reliable one-way valve—keeping unwanted water out while letting you drain with confidence. Its mirror-polished flange isn’t only about durability—it adds a sleek, luxurious look to your boat.

Designed with extended threading, including a ½" NPT tapered section, this scupper adapts through thicker transoms and screws directly into standard seacocks, simplifying installation. The package includes a 316 stainless mounting nut for a secure, worry-free install.

Proven as the original equipment on many offshore saltwater fishing boats—known for rigorous marine environments—this scupper meets the demands of yachts, sport fishing vessels, and coastal cruisers alike.

Why Choose This Scupper?

• Marine-grade 316 stainless steel: Trusted for high corrosion resistance in saltwater conditions 

• Tested reliability on offshore saltwater fishing boats ensures rugged performance 

• Optional flapper replacement kit (#PRE56553KT) makes maintenance cost-effective and sustainable: "These scuppers last almost forever, but the flappers don't…" 

• Easy to size or customize—click “Contact Us” for tailored fittings when the perfect size isn’t listed 

Product Specifications

• Material: Solid‑cast 316 stainless steel body and internal flapper

• Finish: Highly polished flange for premium aesthetics

• Thread Compatibility: First ½" of threads are 1‑½" NPT tapered; extended thread length allows through thick transoms and direct seacock mounting

• Included Kit: 316 stainless mounting nut

• Dimensions:

  • Outside flange diameter: 2 7/8″

  • Thread length: 3 7/16″

  • Required hole size: 1 7/8″

  • Flapper diameter: 1 7/16″