Safe-T-Alert 62 Series Marine Carbon Monoxide - Flush Mount - White - 12V w/Trim Ring [62-542-TR-WT-M]62 Series Marine Carbon Monoxide Flush Mount White 12V with Trim Ring Features: This unit comes with a trim ring to cover existing screw holes and fit newer units into previous installation cutouts. NMMA Listed Component. Space Saving design works in harsh marine environments. Works in extreme temperatures. Only marine CO alarm listed to operational temperatures of 40F to 158F. The alarm has consistently held up in the excessive cold and heat due to