Durable safety alarms designed for the rugged RV environment. All alarms meets RVIA/NFPA requirements and are listed to UL. Upgrade your CO and Propane/LP Gas alarms to a dual alarm that detects both CO and LP Gas. Note: Our 35-741 Dual LP gas / CO alarm alarm is a direct drop replacement for most of the discontinued CCI Controls LP Gas Detectors. CCI ceased operations in Feb. 2009. Be sure to check date codes for expired alarms - replace your Propane and CO alarms that are over 5 years old!