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Ombrinali e scarichi Pozzetto

Cockpit scuppers and drains

Let's now look at scuppers and cockpit drains , fundamental components for safety and water management on board , especially in case of 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

Type Description Where to use it
Through-hull scuppers Pipe with flange, often with grille or screen. Low side exhaust, flush with the wall
Drain plugs with non-return valve They prevent the return of water during navigation. Cockpit, areas exposed to the sea
Scuppers with flexible hose Connect to underdeck drains or siphons. For long or hidden ducts
Drains with siphon/suction cup They prevent water suction (Venturi effect). Connections below the waterline
Internal scuppers with stainless steel/plastic grid They prevent the entry of leaves or debris. Cockpits, deck, engine cockpit

🛠️ 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

  • The well must be able to drain completely within a few minutes .

  • Scuppers should be above the waterline , if possible.

  • If the drains are below the line , they must be equipped with a non-return valve or seacocks (safety valves).

  • Install at least two scuppers per well , one on each side → faster drainage and redundancy.

  • 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
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