There is a common misconception regarding the Ritchie CD-50 line of waterers. They are actually not a model number at all, but the paint process the factory used when they produced metal units.
If you have a Ritchie metal unit that still says CD-50 on the label, chances are that you have one of three units, and most parts for all of them are still available.
Ritchie AC series
There are three units in the AC series, however they all carry the same replacement valve, float and heating elements.
This unit sits about 2 feet tall with a narrow trough, roughly 11 inches wide.
Ritchie Cattle Fountain 3
Sitting about 3 feet tall, the Cattle Fountain 3 features the 3/4" float and valve series. Replacement parts are still available. See the Cattle Fountain 3 parts list.
Ritchie Cattle Fountain 5
Slightly larger than its sister unit, the 3, the Cattle Fountain 5 is wider yet shares the same replacement parts. See the Cattle Fountain 5 parts list.
Ritchie understands that their products have a long life and keeps their parts consistent with older models. If you have questions about the replacement parts that you might be needing, send us a photo of the unit and the label and we will be happy to help get your waterer running.
Find your parts. Every Ritchie model has its own breakdown on the Ritchie waterers and parts page, including the discontinued units.