Attwood Marine HD2000 Heavy-Duty Bilge Pump, 2000 GPH, 1-1/8 in Port, Anti-Airlock Nozzle

Overview

The Attwood Marine HD2000 is a heavy-duty non-automatic bilge pump for boats that need 2000 GPH open-flow capacity in either 12V DC or 24V DC electrical systems. It uses a 1-1/8 inch outlet and is built around a compact body measuring about 5.97 inches high by 3.83 inches in outside diameter, making it a practical fit for many bilge compartments where space, hose routing, and service access matter.

The anti-airlock nozzle helps vent trapped air that can stop a bilge pump from moving water, while the rotating outlet gives more flexibility when routing discharge hose through tight lockers or deep bilge spaces. This is a non-automatic pump, so it is typically wired to a separate bilge switch, float switch, or helm control rather than operating by itself.

Internal details such as tinned and caulked wiring, a molded two-wire seal, a stainless steel motor shaft, and a shaft seal built for long service are useful in wet bilge areas where vibration, corrosion, and chemical exposure are part of normal boat life.

Key features

• 2000 GPH open-flow capacity for high-volume bilge water removal on larger recreational boats, workboats, and yachts.
• Available for 12V DC and 24V DC installations, so the pump can match the boat’s existing electrical system.
• Anti-airlock nozzle vents trapped air while helping prevent spray streams during operation.
• 1-1/8 inch outlet fits common high-capacity bilge discharge hose sizes.
• Rotating outlet helps simplify hose alignment in bilge spaces where the discharge run is not straight.
• Locking tab and swivel base allow eight mounting positions for better placement in tight or uneven bilge areas.
• Advanced resin exterior resists common bilge-area chemicals such as engine oil, strong detergents, and hose plasticizers.
• Tinned and caulked wire, molded two-wire seal, and stainless steel motor shaft help reduce water-related electrical and shaft wear issues.

Variants

This HD2000 pump is offered in two voltage configurations for boats with different DC electrical systems.

The pump capacity, outlet size, anti-airlock nozzle, rotating outlet, and mounting layout remain consistent across these configurations. The main difference is the rated voltage, along with the electrical protection and current draw that match that voltage.

• 4770-1: Rated Voltage 12V DC. This version matches common 12V DC bilge pump circuits and uses a 12A fuse with a maximum current draw of 6.6A.
• 4770-4: Rated Voltage 24V DC. This version is for 24V DC boat electrical systems and uses a 7A fuse with a maximum current draw of 3.5A.

Installation and setup

Install the pump low in the bilge where water naturally collects, while keeping enough clearance to service the strainer area and route the discharge hose without kinks. The 1-1/8 inch hose run should be secured and routed upward to a proper thru-hull discharge point with attention to backflow prevention and the boat’s existing bilge plumbing layout.

Because this is a non-automatic pump, the wiring plan should include the correct voltage model, proper fuse size, marine-grade wiring practices, and a suitable switch arrangement. The 12V version should not be used on a 24V system, and the 24V version should not be used on a 12V system.

Use on board

The HD2000 is a good match for boats where a higher-capacity bilge pump is needed for a main bilge, machinery space, or backup pumping location. Its anti-airlock nozzle is especially useful in installations where the discharge hose layout can trap air after the bilge has been pumped down.

For coastal cruising, fishing boats, and larger vessels with deeper bilges, the combination of high flow, flexible outlet orientation, and voltage-specific options makes it easier to match the pump to the boat rather than forcing the boat to match the pump.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
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Delivery and tracking
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Duties, taxes, and support
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Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.