Attwood Marine Twist-Lock Fuel Fittings, For Mercury/Mariner

Overview

The Attwood Marine Mercury/Mariner Twist-Lock is a fuel fitting range for matching Mercury and Mariner style portable fuel tank and hose connections. The range covers the tank-side female twist-lock fitting with a 1/4-inch NPT thread and the hose-side male twist-lock fitting with a 3/8-inch barb for 3/8-inch I.D. fuel hose.

These fittings are made for marine fuel line service where the connection needs to be easy to disconnect for tank removal, storage, or routine fuel system work. They are suitable for leaded, unleaded, ethanol-blended, and alcohol-blended fuels, which makes them practical for common outboard fuel setups on small boats, tenders, fishing boats, and portable tank installations.

Key features

• Mercury and Mariner twist-lock fitting style for compatible outboard portable fuel systems.
• Available as a tank-side 1/4-inch NPT female twist-lock fitting or a hose-side 3/8-inch barb male twist-lock fitting.
• 3/8-inch barb variant fits 3/8-inch I.D. fuel hose for common outboard fuel line assemblies.
• Die-cast zinc construction on these variants for a solid fuel fitting body in marine use.
• Suitable for leaded, unleaded, ethanol-blended, and alcohol-blended fuels.
• Tank fitting and hose fitting variants mate together within the Attwood Mercury/Mariner twist-lock system.

Variants

This product is offered in two configurations so the fitting can match the connection point on the fuel system.

The main difference is the connection style and fitting role: one variant fits the tank side with a 1/4-inch NPT thread, while the other fits the hose side with a 3/8-inch barb. Both variants belong to the Mercury/Mariner twist-lock fitting family.

• 14530-6: Connection 1/4-inch NPT thread, fitting role Twist-Lock Tank Female. This version is used at the tank connection point and mates with the corresponding male hose fitting in the twist-lock system.
• 14532-6: Connection 3/8-inch barb, fitting role Twist-Lock Hose Male. This version attaches to 3/8-inch I.D. fuel hose and connects to the matching female tank fitting.

Installation and fit

Check the existing fuel tank fitting, hose inside diameter, and engine brand style before installation. The 1/4-inch NPT version belongs on the tank side, while the 3/8-inch barb version belongs on the fuel hose side. Use thread sealant on threaded connections and use the proper fuel hose clamp where a barbed hose connection is installed.

Because fuel fittings are part of the boat’s fuel delivery system, the connection should be checked for correct seating, hose grip, and leaks before the engine is run. Replace worn fittings, loose hose ends, or mismatched connectors rather than forcing parts together.

Use on board

This Attwood Marine fitting range is a good match for boaters maintaining a Mercury or Mariner portable fuel tank setup, building a replacement fuel line assembly, or refreshing a fuel connection that is worn from regular tank removal. It is especially useful on boats where the portable tank is often disconnected for refueling, storage, or cleaning.

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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