Attwood Tsunami MK2 800 GPH 12-Volt Thred Manual Bilge Pump - Reliable

In this review of the Attwood Tsunami MK2 800 GPH manual bilge pump, the bottom line is simple: this is the best non-automatic freshwater manual bilge pump for boaters who need a compact, reliable pump that resists air-locks. The standout reason to buy is the patented X-Air Impeller, which actively ejects trapped air so the pump keeps moving water instead of running dry. Installation-oriented users will also value the rotatable elbow and single-hand cartridge release when servicing pumps in tight compartments.

Key Features

• Patented X-Air Impeller: Forces air bubbles out of the hose and pump so the unit avoids air-locks and keeps pumping water reliably in freshwater use.
• 800 GPH flow rate: Provides robust manual pumping capacity for emergency bilge emptying and bait tank drainage without relying on power-hungry systems.
• Flexible rotatable outlet: The 90 rotatable elbow and dual 3/4' and 1' barb outlets let installers orient discharge precisely and adapt to existing hose runs.
• Single-hand cartridge release: Allows quick access and servicing of the pump cartridge even when the pump is in a hard-to-reach area of the hull.
• Retrofit footprint: Fits the footprint of the prior model for an easy swap into boats set up for the earlier pump design.
• Built-in check valve and wiring length: Includes a check valve to prevent backflow plus 29' of wire and a recommended 5A fuse size for a straightforward electrical hookup.

Who It's For

The Tsunami MK2 is aimed at small-boat owners, anglers using bait tanks, and anyone who prefers a manual backup bilge solution that is easy to install and service. It is particularly useful for freshwater operators who have experienced air-locks with other manual pumps and want a proven solution that reduces the risk of running the pump dry.

Boaters who require an automatic bilge solution or who operate primarily in saltwater with heavy debris may want to consider an automatic or larger-capacity bilge system. This pump is optimized for manual use and freshwater reliability rather than unattended auto operation.

Pros & Cons

Pros

• Eliminates air-locks with the X-Air Impeller, improving reliability in freshwater applications.
• Easy to install and service thanks to the single-hand cartridge release and retrofit footprint.
• Flexible discharge options with rotatable elbow and two barb sizes make routing simple.
• Includes check valve and 29' of wire for practical wiring and installation.

Cons

• Designed as a non-automatic manual pump, so it is not a substitute for an automatic bilge system when unattended operation is needed.
• Performance is specified for freshwater; saltwater operators should verify long-term corrosion resistance for their use.

Specifications

Part Number	5608-7
Flow Rate	800 GPH
Voltage	12V
Recommended Fuse	5A
Outlet Types	3/4' and 1' barb
Check Valve	Yes
Wire Length	29'

Our Verdict

The Attwood Tsunami MK2 is a smart buy for owners who want a dependable manual bilge pump that avoids air-locks and is easy to install and service. For freshwater boats and bait tanks the combination of the X-Air Impeller, flexible outlets, and retrofit footprint delivers strong value for a compact 12V manual pump.

Frequently Asked Questions

Does this pump prevent air-locks?
The patented X-Air Impeller forces trapped air out of the hose and pump so it resists air-locks in freshwater setups.

What size fuse and wiring are required?
Use a 5A fuse as recommended; the unit includes 29' of wire to simplify wiring runs.

Can it replace older models easily?
Yes, the Mk2 retrofits the footprint of the previous offering for a straightforward swap into existing installations.