Scepter - Neptune Portable Fuel Tank - 6 Gallon - 08592. Excellent for use with outboard engines, the Neptune 6 gallon portable marine tank is easy to transport and features Scepter's 2-way vented cap. Made from UV stabilized material, the rugged crush-resistant design is built to fuel your marine adventures for years to come!. Size - 6 Gallons. Dimensions - 20.7"L x 13.0"W x 10.9"H. The "ECO Check" line features a EPA/CARB approved fuel cap and a low permeation tank that virtually eliminates fuel evaporation. Accepts standard 1/4 NPT marine tank fittings. Easy to Transport. Made of UV Stabilized, Rust and Corrosion Resistant HDPE for Maximum Durability. Designed to International Standards. Compact Design for Convenient Storage. Regulations & Safety Compliance:. EPA. SAI Global. CSA. ABYC. JCI. ICMI