Cockpit drains and scuppers are essential components for safety and water management on board , especially in rough seas or heavy rain.

🚿 What are Scuppers?

Scuppers are holes or bushings equipped with fittings and/or valves that allow rainwater or water taken on board in the cockpit or on the deck to flow overboard or into the bilge.

⚙️ Types of Cockpit Drains and Drains

1. Through-hull scuppers Pipe with flange, often with grate or mesh. -> Low side outlet, flush with the wall
2. Scuppers with non-return valves prevent water from entering during navigation. -> Cockpit, areas exposed to the sea
3. Drain plugs with flexible hose Connect to underdeck drains or siphons. -> For long or hidden ducts
4. Drains with siphon/suction cup Prevent water from being sucked back (Venturi effect). -> Connections below the waterline
5. Internal scuppers with stainless steel/plastic grid Prevent the entry of leaves or debris. -> Cockpits, deck, engine compartment

🛠️ Recommended materials

• AISI 316 stainless steel : resistant and long-lasting in marine environments.
• Plastic (ABS, reinforced nylon) : light and easy to install, but less robust.
• Chromed brass : used in old boats, now not very common due to the risk of corrosion.

💧 Safety Rules and Tips

1. The well must be able to drain completely within a few minutes .
2. Scuppers should be above the waterline , if possible.
3. If the drains are below the line , they must be equipped with a non-return valve or seacocks (safety valves).
4. Install at least two scuppers per well , one on each side → faster drainage and redundancy.
5. Check and clean them regularly: sand and leaves easily clog them.

🧰 Useful Accessories

• Anti-debris stainless steel grids
• Threaded pipe fittings
• Shut-off valves (manual or automatic)
• 90° fittings for difficult areas