Attwood Marine Tsunami Mk2 T500 Livewell Aerator Pump, 12V, 500 GPH

Overview

The Attwood Marine Tsunami Mk2 T500 is a 12 V livewell aerator pump for keeping bait and catch supplied with fresh, moving water on fishing boats, skiffs, bay boats, and other small craft with livewell or baitwell plumbing. It sits in the 500 GPH class, with T500 pump data showing 507 GPH at 0 ft head under 13.6 V test conditions, a 3 A fuse rating, and a 3/4 in. barb outlet.

This parent product covers the T500 inlet configurations used to match different hull, seacock, and plumbing layouts. The Mk2 cartridge is serviceable with one hand, the outlet can rotate 360 degrees, and the pump supports installation with straight or 90-degree outlet routing where hose direction matters inside a tight bilge, transom, or livewell compartment.

The pump body is IP68 rated and built around materials selected for wet marine spaces, including a PC/PBT body and lid, nitrile seals, and an SS316 motor shaft. It is also listed against marine ignition protection and electrical wiring standards, which is important when the pump is mounted low in the boat near fuel systems, batteries, and other onboard electrical equipment.

Key features

• 12 V T500 aerator pump for livewell and baitwell water circulation.
• 500 GPH class output, with 507 GPH at 0 ft head and 319 GPH at 3.3 ft head under 13.6 V test conditions.
• 3 A fuse rating and 3/4 in. barb outlet for common livewell hose layouts.
• IP68 rated pump housing for wet bilge, transom, and livewell areas.
• 360-degree outlet rotation helps line up hose runs without forcing the pump body into an awkward position.
• One-handed serviceable motor cartridge helps make cleaning or replacement easier after regular baitwell use.
• Mk2 cartridges are compatible with previous Tsunami models, which helps when refreshing an older Attwood livewell setup.
• Meets ISO 8846 Marine ignition protection and ABYC E-11 and ISO 10133 marine electrical wiring standards.

Variants

This Tsunami Mk2 T500 range is offered with different inlet styles so the same pump family can suit several livewell plumbing arrangements.

The inlet configuration changes between variants. The core T500 specifications remain consistent across the 564X versions, including 12 V operation, the 3 A fuse rating, the 3/4 in. barb outlet, the 1-1/8 in. hole saw size, and the 500 GPH class pump output.

• 5640-4 - Straight inlet. This configuration uses a 3.5 in. long straight inlet with 3/4 NPS threading, which suits straight thru-hull runs where the pump can sit in line with the fitting.
• 5643-4 - 3/4 in. NPT inlet. This seacock version uses a 3/4 in. NPT inlet with a short 0.85 in. inlet length, which helps when the pump connects to a seacock-style fitting.
• 5644-4 - 90-degree inlet. This angled inlet helps route the pump where a straight approach would crowd hoses, bulkheads, or livewell plumbing.

Installation and setup

Match the inlet style to the existing hull fitting or seacock before ordering. The straight inlet version works well when there is room for a direct pump orientation, while the 90-degree inlet helps when the hose path needs to turn quickly after the inlet. The 3/4 in. NPT version is the configuration to consider where the installation is built around a compatible seacock connection.

The 360-degree outlet gives the installer more freedom to point the discharge hose without reworking the whole pump location. That matters in real boats, where livewell plumbing often shares space with steering lines, batteries, transom brackets, and wiring.

Electrical and system integration

This is a 12 V DC pump and should be wired with proper circuit protection using the specified 3 A fuse. As with any livewell pump, wiring should be kept above standing water where possible, supported against vibration, and protected from chafe near the transom, bilge, or livewell wall.

The pump is not a networked marine electronics device and does not connect to NMEA 2000 or NMEA 0183 systems. It is a straightforward livewell pump intended for switched 12 V operation as part of the boat’s plumbing and electrical system.

Use cases on board

This pump is a good match for anglers replacing or upgrading a 12 V Attwood Tsunami livewell aerator, especially where service access and inlet orientation matter. It fits common baitwell and livewell use on fishing boats that need dependable water movement during short runs, long days at anchor, or tournament-style catch care.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

Learn more.

Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

Learn more.

Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

Learn more.