Check valves

Water check valves are essential components for the safety and efficiency of your boat's plumbing. They prevent backflow, avoiding contamination and malfunctions. Whether it's for your toilet, shower, or bilge discharge, a properly sized check valve is crucial. Available with various diameters (from 13 to 38 mm) and connections (threaded or hose tail).

A common mistake is underestimating the importance of these valves, opting for cheap models that wear out quickly or don't guarantee a perfect seal. This can lead to unpleasant surprises, such as black water returning into your shower drain. It's better to spend a few extra dollars and sleep soundly.

Materials and Compatibility: Check valves are mainly made of durable plastic or, for more demanding applications, metal. Always check compatibility with your boat's pipes and fittings. Osculati and Whale are trusted brands, with models to suit every need.

The Nautica Basile Workshop Tip

Before installing a water check valve, verify the flow direction indicated on the valve itself. Incorrect installation will render it useless. Periodically check the seal and clean the valve to remove any debris that may compromise its operation. For black water discharge, choose specific valves resistant to the chemicals found in detergents.

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Complete your plumbing system with our fittings and flexible hoses. You'll find everything in the dedicated plumbing section.

Frequently Asked Questions

Can I use a water check valve for my toilet discharge?

Yes, it is advisable to use a specific toilet check valve, made of materials resistant to the chemicals present in black water and detergents. Make sure the diameter is compatible with the drain pipe.

What is the purpose of a water check valve on a scupper?

The water check valve on the scupper prevents seawater from rising into the pipe and flooding the boat in case of waves or rough seas. It is particularly important for scuppers located near the waterline.

How do I choose the right water check valve for my system?

Consider the type of liquid to be controlled (fresh water, salt water, black water), the diameter of the pipes, the operating pressure, and the environmental conditions (temperature, UV exposure). Consult the product data sheets or seek advice from an expert.

Are plastic water check valves reliable?

Good quality plastic water check valves (such as those produced by Osculati and Whale) are suitable for most marine applications. However, for more demanding systems or corrosive liquids, it is preferable to opt for metal valves.

Can I use a water check valve for my toilet discharge?

Yes, it is advisable to use a specific toilet check valve, made of materials resistant to the chemicals present in black water and detergents. Make sure the diameter is compatible with the drain pipe.

What is the purpose of a water check valve on a scupper?

The water check valve on the scupper prevents seawater from rising into the pipe and flooding the boat in case of waves or rough seas. It is particularly important for scuppers located near the waterline.

How do I choose the right water check valve for my system?

Consider the type of liquid to be controlled (fresh water, salt water, black water), the diameter of the pipes, the operating pressure, and the environmental conditions (temperature, UV exposure). Consult the product data sheets or seek advice from an expert.

Are plastic water check valves reliable?

Good quality plastic water check valves (such as those produced by Osculati and Whale) are suitable for most marine applications. However, for more demanding systems or corrosive liquids, it is preferable to opt for metal valves.