Grey water tanks

On any vessel, grey water collection pits solve a critical problem: the controlled disposal of soapy water from showers, sinks, and galleys. Instead of discharging directly into the sea (where permitted), this wastewater is channeled into a tank for later disposal in designated areas.

Our pits are equipped with integrated submersible pumps, specifically designed to operate in humid environments and resist corrosion. Models with level sensors automatically activate when the tank reaches a certain capacity, preventing flooding and malfunctions.

We offer complete solutions, such as Rule shower drain kits, which include the pit, pump, and necessary fittings for easy installation. Whale pits, known for their robustness, are ideal for installations in confined spaces.

Why Choose a Grey Water Pit with an Electronic Sensor?

Grey water pits with electronic sensors offer several advantages. First, they eliminate the need for a mechanical float switch, which is prone to wear and fouling. Second, the electronic sensor is more precise and reliable, ensuring optimal pump operation. Finally, some models offer the ability to adjust the sensor sensitivity, adapting it to your specific needs.

The Nautica Basile Recommendation

Before purchasing a pit, carefully check the pump flow rate (liters per minute) and the head (maximum height to which the pump can lift water). Also, consider the number of inlets and outlets needed to connect all the drains on your boat. An undersized pit can cause drainage problems and flooding.

• Fast shipping throughout Italy with express courier.


• Official manufacturer's warranty on all products.


• Pre- and post-sales technical assistance.


• Original spare parts available.

Complete your water system with our bilge pumps and hoses and fittings specifically for marine use.

Frequently Asked Questions

What is the difference between a grey water pit and a black water pit?

Grey water pits collect drainage from sinks, showers, and kitchens. Black water pits collect sewage from toilets and must comply with specific disposal regulations.

Can I connect multiple drains to a single pit?

Yes, pits have multiple inlets of different sizes (typically 19 to 38 mm) to connect multiple drains. Verify that the pump flow rate is sufficient to handle the total flow.

How do I clean the grey water collection pit?

Use specific products for cleaning grey water tanks, avoiding harsh detergents that could damage the pump or sensors. Periodically check for obstructions in the drain pipes.

What size pit do I need?

The capacity depends on the number of people on board and the frequency of use of showers and sinks. A 10-20 liter pit is generally sufficient for a small boat with a crew of 2-4 people.

Is the pit easy to install?

Installation is relatively simple but requires basic plumbing skills. If you are not comfortable, contact a professional installer. Be sure to securely fasten the pit to avoid vibrations and noise.

What is the difference between a grey water pit and a black water pit?

Grey water pits collect drainage from sinks, showers, and kitchens. Black water pits collect sewage from toilets and must comply with specific disposal regulations.

Can I connect multiple drains to a single pit?

Yes, pits have multiple inlets of different sizes (typically 19 to 38 mm) to connect multiple drains. Verify that the pump flow rate is sufficient to handle the total flow.

How do I clean the grey water collection pit?

Use specific products for cleaning grey water tanks, avoiding harsh detergents that could damage the pump or sensors. Periodically check for obstructions in the drain pipes.

What size pit do I need?

The capacity depends on the number of people on board and the frequency of use of showers and sinks. A 10-20 liter pit is generally sufficient for a small boat with a crew of 2-4 people.

Is the pit easy to install?

Installation is relatively simple but requires basic plumbing skills. If you are not comfortable, contact a professional installer. Be sure to securely fasten the pit to avoid vibrations and noise.