A boat scupper with a non-return valve is a type of scupper that includes a valve designed to prevent water from flowing back into the boat's interior. The valve works by allowing air to flow into and out of the boat, while preventing water from flowing in the opposite direction. This can be particularly useful in rough seas or other conditions where water may splash onto the deck of the boat, as it helps to prevent water from entering the boat and causing damage or flooding.

The non-return valve is typically located inside the scupper and may be made from a variety of materials, such as rubber, silicone, or PVC. The valve may be spring-loaded or rely on gravity to close, depending on the specific design of the scupper. Some scuppers with non-return valves may also include filters or other features to help remove pollutants and other contaminants from the incoming air.

Overall, a boat scupper with a non-return valve is a useful addition to any vessel, as it can help to protect the boat from water damage and keep the interior clean and dry.

Features:

• Tail: 1-1/2 Inch - 38mm
  
• Cut Out: 40mm
• Thread Length: 45mm
• Colour: Black & Silver
  
• Nylon thru-hull connection skin fitting and barb tail, 316 grade stainless steel trim plate
• Non return valve
• Skin fitting and tail is glass reinforced nylon compound
• For thin hull sections up to 5/8" (16mm) maximum
• Skin fitting includes backnut
  

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