Self-Bailing Ball Scupper Valve – 70% More Drainage Flow

This self-bailing scupper with a floating ball valve is designed to keep your boat’s deck and cockpit dry, even in rough conditions. As water accumulates on deck, the valve automatically drains it overboard while preventing backwash from waves. This makes it ideal for small to mid-sized powerboats, RIBs, and fishing vessels with self-bailing cockpits, where quick drainage and safety are paramount.

The scupper’s design is engineered for high performance: a larger exit opening delivers ~70% greater flow compared to standard scuppers, rapidly clearing rain and spray from your deck. The neutral-buoyancy ball is made of a material that won’t swell or degrade with fuel or oil, ensuring it maintains a tight seal without sticking over time. A stainless steel pin secures the ball in place and adds extra safety, while a locking screw keeps it firmly attached. For maintenance, the cap features an easy twist-off mechanism, allowing you to remove it quickly and clear away debris or marine growth. The unit fits standard 1-1/4” (32 mm) drain hoses, as its internal gasket is slotted to accommodate this common hose size.

Use Cases and Recommendations:

• Recommended for cockpit drain systems on small and medium boats (approximately 4–7 m in length) such as fishing boats, RIB inflatables, and day cruisers, where fast deck drainage is critical.
• Especially useful for vessels that regularly ship water on deck – for example, offshore fishing boats or high-performance craft that may take waves over the bow. The ball scupper quickly expels water, keeping the cockpit drier and reducing slip hazards.
• An ideal upgrade to replace old flapper-style scuppers – this ball valve model offers a more reliable seal and significantly higher drainage capacity.
• Easy transom or deck installation – mounts with screws using the pre-molded holes. When properly sealed, it meets ABYC and USCG safety requirements for cockpit drainage.
• A must-have component for any boat with a self-bailing cockpit – ensures rain and spray water are rapidly drained, enhancing crew safety and comfort by preventing water accumulation on deck.