attwood P-Trap Fuel Tank Vent 90° Composite for 5/8" Hose — Splash-Resistant Black

Attwood 66419-3 is a composite 90-degree P-trap fuel tank vent designed to keep water out of your fuel tank while allowing proper venting during normal boating and washdowns.

This compact, corrosion-resistant vent fits 5/8" I.D. hose and meets ABYC standards for marine fuel systems. Its P-trap geometry provides splash resistance so water is less likely to enter the tank opening, yet air can escape freely as fuel is added or consumed. The unit replaces damaged vents by attaching inline to the existing tank vent hose; a hose clamp is required for secure installation. Built by Attwood, a long-established marine-engineering company, this vent is intended to be a durable, easy-to-install component of a compliant fuel system.

How does this vent reduce the risk of water entering my fuel tank?

The 90-degree P-trap shape creates a splash-resistant barrier that deflects water away from the vent opening during normal boat motion and deck washdowns. It’s engineered to permit air flow while minimizing direct water intrusion. In many installations the P-trap removes the need for an additional anti-siphon loop in the vent hose.

• P-trap angle channels splash away from the hose inlet
• Composite material resists corrosion and degradation
• Meets ABYC standards for improved system compliance
• Designed for 5/8" I.D. vent hose to ensure correct fit

Will this vent fit my boat’s existing vent hose and how is it installed?

The vent is sized for 5/8" inside-diameter vent hose, which is a common size on many small- and medium-sized boats. Installation is straightforward: cut the vent hose where the vent will sit, insert the fittings, and secure both connections with hose clamps (not included). No special tools are required beyond common hose clamps and a screwdriver.

• Pre-sized for 5/8" I.D. hose for direct replacement
• Install inline by clamping—hose clamp required
• No anti-siphon loop usually necessary when using this P-trap
• Quick swap to replace damaged or worn vents

What materials and performance characteristics should I expect?

The vent is molded from a composite material chosen for marine environments, offering splash and corrosion resistance without the weight or galvanic concerns of metal parts. It vents air reliably during fueling and normal operation, and its low-profile 90-degree design reduces snagging and exposure on deck or under covers. The product is tested to meet ABYC recommendations for marine fuel vents.

• Composite construction for durability in salt and fresh water
• Splash-resistant design reduces water ingress risk
• Compact 90-degree angle for space-efficient installation
• ABYC compliance supports regulatory alignment

Who this is for: Boat owners, installers, and marine technicians who need a reliable replacement or upgrade for a fuel tank vent. It’s suited to recreational boats that use 5/8" I.D. vent hose and want a corrosion-resistant, splash-resistant solution that helps maintain safe venting without adding complex hose routing. Choose this Attwood vent if you want a simple, standards-compliant part from a long-established marine supplier that’s easy to fit and helps protect your fuel system from water intrusion during everyday use.