Scuppers, cockpit drains, hydraulic accessories

Seacocks, thru-hulls, and valves are critical components for boat safety. An unsuitable fitting or a seized valve can lead to flooding and serious damage. That's why Nautica Basile only offers products from Guidi, crafted from marine-grade bronze that's resistant to galvanic corrosion and tested for long-lasting performance.

Choose the model that best suits your needs: standard seacocks, 90° thru-hulls, full-flow ball valves, and threaded fittings of all types. Always verify the thread diameter and fitting type (male/female) before ordering.

Common Problems:

* Galvanic Corrosion: Using incompatible materials (e.g., steel and bronze in contact) accelerates corrosion. Always use bronze or brass fittings for seacocks and thru-hulls.
* Seized Valves: Scale and debris can seize ball valves. Open and close valves regularly to keep them working efficiently. If a valve is stuck, disassemble and clean it.
* Leaks: Tighten fittings securely and use Teflon tape or sealant to prevent leaks. Regularly inspect hoses and fittings for any signs of leaks.

Basile Workshop Tip

* Replace seacocks and valves every 5-7 years, even if they appear to be in good condition. Internal corrosion can weaken components and cause sudden failures.
* Use only genuine Guidi replacement parts to ensure compatibility and longevity.
* Install a Y-strainer upstream of the water pump to protect it from debris.
* Ensure that hoses are securely fastened and do not rub against sharp edges or other surfaces.

• Fast shipping throughout Italy.


• Official Guidi warranty.


• Qualified technical support.


• Only products tested and approved by our staff.

Complete your plumbing system with our spiral-reinforced hoses and AISI 316 stainless steel hose clamps.

What is the difference between a seacock and a thru-hull fitting?

A seacock is used to draw water from the outside (e.g., for engine cooling or the plumbing system), while a thru-hull fitting is used to discharge used water (e.g., from the toilet or sink). Both components must be made of marine bronze to resist corrosion.

How do I choose the correct size seacock?

The size of the seacock depends on the flow rate of the pump or system that needs to be supplied. Consult the manufacturer's technical specifications to determine the correct size. In general, it is better to choose a slightly oversized seacock to ensure sufficient flow.

What does full-flow ball valve mean?

A full-flow ball valve has an internal bore with the same diameter as the pipe to which it is connected. This allows for maximum flow without restrictions, reducing the risk of clogging. This is especially important for toilet discharges, where debris can easily block valves with reduced flow.

Can I use a brass valve instead of a bronze valve?

No, brass is not suitable for use in the marine environment because it is more susceptible to galvanic corrosion than bronze. Always use marine bronze valves and fittings for seacocks and thru-hulls.

What is the difference between a seacock and a thru-hull fitting?

A seacock is used to draw water from the outside (e.g., for engine cooling or the plumbing system), while a thru-hull fitting is used to discharge used water (e.g., from the toilet or sink). Both components must be made of marine bronze to resist corrosion.

How do I choose the correct size seacock?

The size of the seacock depends on the flow rate of the pump or system that needs to be supplied. Consult the manufacturer's technical specifications to determine the correct size. In general, it is better to choose a slightly oversized seacock to ensure sufficient flow.

What does full-flow ball valve mean?

A full-flow ball valve has an internal bore with the same diameter as the pipe to which it is connected. This allows for maximum flow without restrictions, reducing the risk of clogging. This is especially important for toilet discharges, where debris can easily block valves with reduced flow.

Can I use a brass valve instead of a bronze valve?

No, brass is not suitable for use in the marine environment because it is more susceptible to galvanic corrosion than bronze. Always use marine bronze valves and fittings for seacocks and thru-hulls.