Dual Propane/Carbon Monoxide Alarm with Trim Ring detects both gas leaks and CO gas simultaneously. Alarm is designed for the extreme RV environment and is wired in so there are no missing or dead batteries to replace. Meets RVIA/NFPA requirements and conforms to UL 1484 RV and CSA 6.19. Models with Solenoid Kit Include: Valve, alarm and built in relay to control the solenoid valve. Shuts off gas if a leak is detected. Standard 3/8 NPT.