RV PROPANE DETECTOR SAFE-T-ALARM (DUAL CO/PROPANE ALARM. CO/propane gas alarm. Replaces all 30-442 series propane alarms and most CCI Control flush mount propane alarms. Test/Reset Button – Mute alarm during ventilation.Tests both alarm functions with one touch. Meets RVIA/NFPA requirement. Flush mount, white. Case size: 6.375″W x 2.875″H x 1.25″D. Cut-out size: 5 1/2″ x 2″.