Years ago, I bought in NYC during a trip from France an accessory to control water temperature in my darkroom.
I am looking for a new one, at least a new plastic part I still have thermometers.
Do you know where I can find it
Thanks for your help.
Do some Google searching on the product you're looking for (Pfaff is the manufacturer, BTW). I found a few listings for used thermometer wells in the States. I don't know if you'll find much in Europe. Shipping will likely be more expensive than the item.
A visit to the plumbing and heating department of a hardware store should bring up something. You're looking for a thermometer with a thermowell and a matching piece of pipe which allows to screw on the thermowell (called a "Fühler-T-Stück" in german) and looks like the one in the first link.