Looking for this model to replace my 70-742R LPN /CO unit. Any ideas? My remote valves/knobs on the side of my Barth don't work anymore and I can't find any replacements.

It looks like it is made for the job. Like most CO detectors, it will expire in five years.

You should be able to reuse the wires from the sensor to the valve.

Found a replacement 25-742-R on Ebay only problem is that it is white but the wiring is the same and it includes the solenoid. Everywhere else they were back ordered.