The Self Life my be the factor here. I purchased the CO and the Fuel Vapor
detectors over 5 years ago, along with some other boat equipment as Boat US
was closing it's store in Seattle.

Never realize that might be a problem..

I will get the mfg and model number and see it I can get a replacement
sensor.. I think the brand name was Aqua..(something or other) I don't see
them listed in any of the current catalogs (not a good omen).

Steve
s/v Good Intentions