Scepter - Neptune Portable Fuel Tank - 3 Gallon - 08590. Excellent for use with outboard engines, the Neptune 3 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!. Features:. Size - 3 Gallons. Dimensions - 16.7"L x 10.5"W x 8.1"H. The "ECO Check" line features a EPA/CARB approved fuel cap and a low permeation tank that virtually eliminates fuel evaporation. Molded from UV stabilized, cross-linked polyethylene. Accepts standard 1/4 NPT marine tank fittings. Easy to Transport. Designed to International Standards. Compact Design for Convenient Storage. Regulations & Safety Compliance:. EPA. SAI Global. CSA. ABYC. JCI. ICMI