4D Commerical Grade Battery BoxThe HM408 Commercial Battery Box is a battery storage solution for sizes group 4D batteries, including Marine, RV and Commercial equipment. It features a four corner fastening system and captive lid for easy installations, large cable entry holes for heavy gauge wires, full flow ventilation for releasing battery gasses, and a large battery acid reservoir. Its rugged, rotationally molded design provides ultimate protection in low-temperature environments and protects against UV, oil, gas and other contaminants. Perfect installation in a boat, camper, motorhome, trailer, or caravan, as well as, commercial and generator equipment.Features:Designed for a group 4D batteriesA four-corner fastening system for easy installationLarge cable entry holes for heavy gauge wires (up to 4/0 AWG)Large internal reservoir to collect battery acidRugged, rotationally molded design for extreme conditionsMeets Coast Guard (USCG) Code of Federal Regulations 183.420Meets American Boat and Yacht Council (ABYC) E-10.7Included:Group 4D Battery Box and Fastening Knobs