Attwood 66419-3 Composite 90° P-Trap Fuel Tank Vent | ABYC Standard

Overview

The Attwood 66419-3 is a compact, durable composite 90-degree P-trap fuel tank vent designed for 5/8" I.D. hose. It allows air to vent freely as you fill the tank, while helping prevent water from entering the fuel system during routine sea conditions and washdowns. This design also removes the need for an additional anti-siphon loop in the vent hose, simplifying installation and reducing hose clutter on small vessels.

Key benefits at a glance

• Seaworthy protection: splash-resistant and corrosion-resistant build stands up to salt spray and marine environments.
• Effortless installation: connects directly to the vent line with a standard 5/8" I.D. hose and requires only a hose clamp.
• Vent during fueling: vents air as the tank fills, helping to minimize pressure buildup and smooth operation.
• ABYC compliant: designed to meet recognized standards for marine fuel systems.
• Replacement option: ideal for substituting damaged vents along existing vent lines.

Installation and compatibility

Designed for 5/8" inner-diameter hose, the Attwood 66419-3 is a straightforward replacement that fits a wide range of boats. When installing, secure the vent to the vent line with a compatible hose clamp, ensuring a snug, leak-free connection. The unit is intended to replace damaged vents by integrating with your fuel tank vent path.

Real-world use cases

Boat owners report smoother fuel venting during refueling stops, particularly in choppy water or after washdowns when spray can threaten entrapment. The splash-resistant design helps keep moisture from entering the system, while the compact profile fits neatly in engine rooms, bilges, or near fuel tanks without protruding into tight spaces. This vent serves as a practical, no-fuss component for maintaining a steady venting path across typical boating scenarios.

About Attwood

Attwood has spent over a century engineering, testing, and manufacturing marine components known for reliability and regulatory compliance. This fuel tank vent reflects the brand’s emphasis on easy installation, durable materials, and a broad range of marine accessories that support safer, simpler boat maintenance.