Safe-T-Alert 62 Series RV Carbon Monoxide - White - Flush Mount - 12V w/Trim Ring [62-542-TR-WT]62 Series RV Carbon Monoxide White Flush Mount 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 CO alarm listed to operational temperatures of 40F to 158F. The alarm has consistently held up in the excessive cold and heat due to the high