NOCO HM426 Features:

Commercial Grade - Designed to accommodate two (2) 6V batteries, including automotive, marine, RV, and other commercial batteries.

• Rugged Design - Four corner fastening system and captive lid for easy installations, large cable entry holes for large gauge cables, full flow ventilation for releasing battery gases, and a battery acid reservoir.
• Designed for Rugged Environments - Impact-resistant down to minus 40 degrees Fahrenheit, withstands acid, gas, oil, and other contaminants, and immune to UV exposure.
• Keeps your Battery Safe - Limits water entry, effectively collects battery acid, allows adequate ventilation, and protects against accidental contact of battery terminals.
• Certified and Tested - Meets United States Coast Guard (USCG) Code of Federal Regulations 183.420 and American Boat and Yacht Council (ABYC) E-10.7 specifications.