That said, it is not a requirement to have a safety solenoid valve in conjunction with the leak detector. An audible alarm is typical for many. Safe-T-Alert makes a direct replacement for the older CCI Controls leak detector, but if you still want the solenoid valve, you’ll have to purchase a whole new kit. In other words, the new detector is NOT compatible with the older solenoid valve. In this case, the Safe-T-Alert model you’ll want is Model 70-742-R.
If you just want to replace only the detector inside the coach, I recommend you totally remove the existing solenoid valve in the piping. You’ll need some additional fittings and it necessitates a timed pressure drop test after the removal, but this is the least expensive route to take. Many people, however, feel more comfortable knowing that a solenoid valve will indeed shut the flow of propane off completely, but again, it is not a safety requirement.