Attwood Marine Fuel/Water Separator, 10 Micron, Double Seal

Overview

The Attwood Marine Fuel/Water Separator is a 10-micron marine fuel filtration range for helping remove water and fine contaminants before fuel reaches a 2-cycle or 4-cycle engine. It is made for boats that need a serviceable fuel/water separator setup in the fuel line, especially where moisture in the tank or fuel supply can lead to rough running, poor starts, or avoidable carburetor and injector issues.

The range includes a universal separator kit with a mounting bracket and a replacement canister option. The assembly uses universal 3/8-inch ports and a double-seal configuration, giving installers a straightforward way to add or service a separator on many outboard and small-boat fuel systems.

Key features

• 10-micron filtration helps trap water and fine fuel contaminants before they move farther through the fuel system.
• Supports 2-cycle and 4-cycle marine engine applications when the vessel is matched to this separator style.
• Universal 3/8-inch ports on the assembly suit common marine fuel-line layouts.
• Double-seal configuration helps the filter seat securely during service.
• Universal kit configuration includes the filter, mounting bracket, and brass plugs for a complete separator installation.
• Replacement canister configuration supports routine maintenance of an existing compatible separator assembly.

Variants

This product is offered in two configurations: a universal fuel/water separator kit and a replacement fuel/water separator canister. Both are part of the same Attwood fuel filtration family, but they serve different maintenance and installation needs on board.

The main difference is whether the boat needs a complete separator kit with mounting hardware or only the replacement canister for an existing compatible setup. The 10-micron filtration and double-seal design are consistent across the range.

• 11840-7: Universal Fuel/Water Separator. This is the kit version for adding or replacing a full separator setup, with the filter, bracket, and two brass plugs included for installation.
• 11841-4: Fuel/Water Separator. This is the replacement canister for servicing a compatible separator assembly without replacing the bracket setup.

Installation and setup

Mount the separator where it can be reached for inspection and filter changes, while keeping it protected from direct impact and excessive bilge water exposure. The 3/8-inch ports make it easier to integrate with common marine fuel hose arrangements, but the fuel line, clamps, and routing should always match the vessel’s fuel-system requirements.

On small fishing boats, runabouts, and coastal cruising boats, this style of separator is commonly fitted between the fuel tank and engine. Leave enough clearance below and around the canister so routine replacement does not turn into a tight engine-well job.

Maintenance and use on board

A fuel/water separator is a practical service item, not a fit-and-forget part. Check it as part of seasonal commissioning, after questionable fuel fills, and before longer runs where fuel contamination would be more than a dockside inconvenience.

This product is a good match for boat owners maintaining outboard and small-boat fuel systems who want a simple separator setup with a known 10-micron rating and an available replacement canister for future service.

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.