Rotationally molded from the highest quality, low density polyethylene to maintain their tough impact properties in climates down to -40 °F (-40 °C). Acid, gasoline, oil, salt, chemical and UV-resistant. Meets USCG Code of Federal Regulation 183.420 and ABYC E-10.7 specification. Features include large cable entry holes, full flow ventilation, four-corner fastening system with captive lid and brass inserted star knobs.