SW1150 features a free-swinging rigid door (“flapper”) and hidden silicone seal allowing for faster drainage and better one way valve performance compared to the traditional rubber flapper scupper where the flapper must flex and often stays in the open position due to rubber “memory”.

This scupper assembly is TIG welded together by Seaworthy Innovations at our Westborough, MA facility. The 25 degree Thru-hull wedge allows the scupper to “rest” in a closed position as most transoms are angled 10-15 degrees. All metal components are marine grade 316 stainless steel.

For use with 1.5” ID drain hose.

For use with 3.25” Thick Transom or less

Material Information:

Scupper Frame: 316 Stainless Steel (mirror-polished)
Flapper: 316 Stainless Steel (mirror-polished)
Scupper Backplate: 316 Stainless Steel (Electropolished)
Seal: Black Marine Grade Silicone
Adhesive: 3M VHB
Thru-hull Fitting: 316 Stainless Steel (Electropolished)
Thru-hull Nut: 316 Stainless Steel

Important Product Information:

• SW1150 is intended for transom mount applications only.

• SW1150 should be installed by a qualified marine technician.

• SW1150 is sold individually.

• SW1150 should be paired with a self-draining deck only.

• SW1150 should never be relied on as perfect one-way valves as scuppers may allow water to backflow.

• SW1150 is Patented by Seaworthy Innovations, LLC.

• SW1150 should be installed in 60F or warmer to ensure the 3M VHB adhesive cures properly.