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May be easiser to find by model on furnace.Do you have that number?
Wow that is an old one. Not going to find anything by unit model (lol)
I did a bit of research on this yesterday after I started looking at it and it appears most of the answers or recommendations I came across was to go with the VR8300 combination valve.
I would look at it. It is a 3/4 inlet outlet but should come with 3/4 to 1/2 adapters in box.
That should probably work.You may have to adjust or change the regulator to match .As for the transformer, there should be no reason to have to replace it.
Some are adjustable and some are set from factory.I would be lying if I said I knew you could adjust yours.If adjustable there will be a screw under a cap that can be turned. You would need a manometer to adjust .
1. See pic below for regulator
2. Using the all in one would eliminate need for the manometer as the regulator is built into the valve to automatically regulate pressure.
3. Valve will have some removable plugs for attaching manometer
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