Marine Scupper Adapter | ABS Boat Drain Check Valve Anti-Backflow

Problems This Product Solves

• Water Backflow Through Drain Holes: The rubber check valve plate opens under outward water pressure to drain freely, then closes automatically to block water from flowing back in through the scupper hole.
• Deck Flooding When Docked or in Rough Seas: Prevents wave wash and wake water from entering the deck through open scupper holes when the boat is stationary or in choppy conditions.
• Corrosion & Degradation of Drain Fittings: Thickened ABS shell is antioxidant, UV-resistant, and corrosion-proof — built for long-term marine use in saltwater environments.
• Odor from Bilge Water: One-way valve prevents bilge odors from venting back up through the scupper drain hole onto the deck.
• Difficult Installation: Simple assembly — install rubber check valve plate into ABS shell, clamp clip tightly, fix with included screws. No special tools required.

Key Features

• Rubber Check Valve Plate: One-way rubber flap opens to drain water out, closes automatically to block backflow — passive operation, no maintenance required.
• Thickened ABS Shell: Thick, wear-resistant, safe, and odor-free ABS material — antioxidant and lasting durable for marine environments.
• Antioxidant Treatment: Resists oxidation, UV exposure, and saltwater corrosion for extended service life.
• Widely Applicable: Fits standard scupper drain holes on boats, yachts, kayaks, and other marine vessels.
• Simple Screw-Mount Installation: 4× mounting screw holes — installs securely with included self-tapping screws.
• Compact & Lightweight: Ø71.3mm flange, only 10.8mm thick, 25g — minimal profile, no obstruction on deck.

• Material: ABS (shell) + Rubber (check valve plate)
• Outer Flange Diameter: Ø71.3mm (2.81in)
• Total Thickness: 10.8mm (0.425in)
• Inner Opening Diameter: Ø40mm (1.57in)
• Screw Hole Diameter: Ø2.7mm (0.106in)
• Weight: 25g
• Color: White (ABS shell) + Black (rubber valve)
• Function: Effective prevention of water backflow through drainage holes
• Applications: Boats, yachts, kayaks, marine deck drainage systems