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I'm so pleased to find this site again. My old link stopped working and I've just discovered it via Google again. Of course I have a question.
I went down to check my furnace before firing up and discovered that the water had risen well over the top of the glass. I did Dan's troubleshooting procedure in "Lost Art" (p. 210) and discovered that the water feeder was leaking and I can't stop the leak by jiggling the valve stem. Is it part #341600 (Mcdonnell 47-2) that my heating guy has to replace ("valve, cartridge and stainer") or do I have to replace the whole unit that sits beside the big float unit?
Further to this, while reading about the low water cutoff Dan says there are two types- Mcdonnell 47-2 and also No. 67. I discover I have both! Is this normal?(see photo)
Thanks for your help