Attwood Marine Flush Mount Fuel Vent, SS316, 5/8 in Hose, 7/8 in Max Hull, 1-3/8 in Hole

Overview

The Attwood Marine Alloy Flush Mount Fuel Vent is a 316 stainless steel fuel tank vent for boats that need a clean hull finish without a protruding exterior cap. It fits 5/8 inch inner diameter vent hose, installs through a 1-3/8 inch hole, and is suitable for hull thicknesses up to 7/8 inch.

This vent is built for marine fuel venting applications where the outside fitting should sit close to the hull and stay less exposed to bumps, dock contact, and routine washdowns. The cap can be removed with a hex head wrench, giving access for filter cleaning and fuel system pressure testing without replacing the whole fitting.

Key features

• 316 stainless steel alloy construction helps resist corrosion in saltwater and freshwater environments.
• Flush exterior profile reduces the chance of damage from hull scrapes, dock contact, or gear brushing against the fitting.
• Accepts standard 5/8 inch inner diameter marine fuel vent hose.
• Fits hulls up to 7/8 inch thick with a 1-3/8 inch installation hole.
• Removable cap allows filter cleaning and fuel system pressure testing with a hex head wrench.
• Supplied with two silicone gaskets to support a sealed installation at the hull.

Variants

This fuel vent is offered in two configurations for different hose routing needs.

The vent body, 316 stainless steel alloy construction, 5/8 inch hose fit, 7/8 inch maximum hull thickness, and 1-3/8 inch installation hole are consistent across the listed versions. The difference is the vent outlet style.

• 66031-3: Straight vent. This version works for installations where the vent hose can run directly from the fitting without needing an immediate change in direction.
• 66032-3: 90 vent. This version helps when space behind the hull is tighter or the hose needs to turn soon after the fitting.

Installation and fit

Before drilling, confirm the mounting location has enough backing space for the selected straight or 90 degree hose path. The fitting is intended for a 1-3/8 inch hull opening and should be paired with 5/8 inch inner diameter fuel vent hose.

The flush face makes it a good match for hull sides, cockpit-adjacent areas, and exterior locations where a cleaner profile is preferred. As with any fuel system component, the vent should be installed so the hose runs without kinks, low traps, or sharp bends that could restrict tank breathing.

Maintenance and care

The removable cap gives practical access for cleaning the filter and pressure testing the fuel system. Periodic inspection is useful on boats that see salt spray, fuel splash, heavy washdowns, or long storage periods, especially around the gasket area and hose connection.

What’s included

• Flush mount fuel vent
• Two silicone gaskets

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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