Attwood Marine Tsunami Mk2 T500 Recirculating Aerator Kit, 500 GPH, 3/4 in Hose

Overview

The Attwood Marine 5253-4 is a Tsunami Mk2 T500 aerator kit for built-in livewells that do not have a thru-hull recirculation system. It recirculates livewell water through a separate spray head, which helps keep water moving and oxygen-rich when the boat cannot rely on a thru-hull connection.

This kit is built around a T500 pump rated at 500 gallons per hour, uses a 3/4 in. (19 mm) hose path, and calls for a 3A fuse. The pump body can handle occasional submersion, but the electrical wires must stay out of the water.

It fits well on fishing boats that already have a freshwater fill system and need a self-contained recirculation loop. It also works as a backup pump in a fail-safe livewell setup, which is useful when keeping bait or a catch stable during long runs or while drifting away from a clean water pickup.

Key features

• 500 GPH T500 pump for livewell recirculation
• Separate aerator spray head keeps water moving inside the tank
• Built for livewells without a thru-hull recirculation system
• 3/4 in. (19 mm) outlet hose size for common livewell plumbing layouts
• Sealed pump body can be occasionally submerged, while wiring stays dry above the waterline
• Useful as an added recirculation loop or as a backup pump in a fail-safe system

Installation and fit

The plumbing side is straightforward, with a straight thread-to-barb connector, 3/4 in. poly hose, and hose clamps included in the kit. The supplied hose length is 23 in., so it suits compact runs around a livewell or bait tank where the pump and spray head are mounted fairly close together.

The stainless steel strainer helps keep debris out of the pump, which matters in tanks that see scales, grass, or bait residue. For a clean installation, mount the pump where the body may see splashes or occasional submersion, but keep wire connections in a dry location above the water level.

Use on board

This kit makes sense for anglers running a built-in livewell on boats that already have a freshwater fill system but need recirculation when underway or when the thru-hull feed is not in use. It is also a practical match for owners updating an older livewell system without reworking the whole tank setup.

What’s included

• 500 GPH Tsunami aerator pump with short inlet and threaded outlet
• Aerator spray head
• Stainless steel strainer
• Two plastic hose clamps
• 3/4 in. x 23 in. poly hose
• Straight thread-to-barb connector

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.