Todd’s 91-2339 8D High Double Battery Box features seamless, heavy wall construction, superior chemical resistance (eliminating concerns of electrolyte spills or contact with grease/oil) and full flow ventilation to ensure adequate cooling to enhance the longevity of the battery. Todds battery boxes maintain tough impact properties down to -40.When properly installed, complies with USCG code of Federal Regulation #33 Sub-chapter 183.420.