Attwood Marine Shower Sump Pump System, 12V, Automatic, 3/4 in Outlet

Overview

The Attwood Marine Shower Sump Pump System is a 12V gray-water sump for moving water from a boat shower, sink, or tub into the proper discharge line. It combines a sump box with an automatic Attwood Sahara pump, giving the installer a contained way to manage drainage where gravity alone will not move water out of the compartment.

The range covers 500 GPH and 750 GPH configurations, with a 3/4 inch pump outlet, 36 inch wire leads, and inlet options for 3/4 inch, 1 inch, 1-1/8 inch, and 1-1/2 inch hose connections. The box uses a gasketed snap-in lid to help control overflow, and the air vent helps reduce air locks during operation.

Key features

• 12V operation fits common DC house and plumbing circuits on small and midsize boats.
• Automatic Sahara pump starts as the sump fills and removes accumulated gray water from shower, sink, or tub drains.
• Gasketed snap-in lid helps seal the box against overflow and can be removed for cleaning.
• Air vent helps prevent air locks, a common cause of poor sump drainage after the box has taken in air.
• Slotted mounting feet allow installation and removal without fighting the box in a tight locker or bilge area.
• Straight mesh filter supports quick inspection and cleaning before hair, soap residue, or debris reaches the pump.
• 3/4 inch pump outlet and multiple inlet hose sizes support connection from up to three drains when the layout allows it.
• Meets or exceeds applicable ABYC and USCG standards for this type of marine sump system.

Variants

This product is offered in two 12V configurations. The main differences are pump capacity and the sump box size associated with each part number.

Both versions use the same sump-system concept, with a gasketed lid, air vent, mesh filter, 36 inch wire leads, and a 3/4 inch pump outlet.

• 4141-4: 500 GPH. This configuration uses the standard box size, about 8-1/2 inches by 7-1/4 inches, for installations where the expected gray-water flow is moderate and space is limited.
• 4143-4: 750 GPH. This configuration uses the large box size, about 11 inches by 7-1/4 inches, for layouts with higher drainage volume or more room allocated for the sump box.

Installation and fit

Install the sump in an accessible low point near the shower or drain lines so water enters the box freely and the lid can still be removed for inspection. The multiple inlet sizes help match common hose runs from a head sink, shower drain, or galley sink, while the 3/4 inch outlet connects to the discharge hose.

Because this is a 12V pump system, wiring should be routed and protected as part of the boat's DC system. The 500 GPH version uses a 3A fuse, and the 750 GPH version uses a 5A fuse, so the final circuit protection should match the specific variant being installed.

Use cases on board

This sump is a practical match for cruisers, fishing boats, and sailboats that need controlled gray-water drainage from enclosed shower pans or sinks. It is especially useful where the sump box must sit in a bilge or locker and still remain easy to open after a weekend of soap residue, hair, and normal cabin use.

Maintenance and care

Service mainly comes down to keeping the lid, gasket, vent, and mesh filter clean. Check the box after heavy use, rinse out collected debris, and make sure the float and pump area move freely before longer trips or after the boat has been left unused.

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.

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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.

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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.

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