MTI Industries 30 Series 12-Volt Safe-T-Alert Flush Mount RV Propane/LP Gas Alarm in White 30-442-P-WT - The Home Depot
MTI Industries 25 Series 12-Volt Safe-T-Alert Mini RV Dual Carbon Monoxide/Propane Alarm in White 25-741-WT - The Home Depot
RV Carbon Monoxide & Propane Gas Alarm, Briidea Dual LP/CO Alarm with Separate LED Indicator Light, 100dB Loud Alarm, Provide You with Early Warning to Ensure Safety, 12 VDC - Amazon.com