Once you have determined the sizing of your seal, we need to know the materials the seal is made from

1. What is the rotating seal face made from? Is it a black rigid material? Then it is most likely carbon.

2. What are the rubber or elastomer portions of the seal made from? Unless you are pumping chemicals or high temperature liquids, then it is most like Nitrile (also called NBR or Buna-N).

3. What is the "stationary" or "seat" made from? Is it a white, hard material? Or, is it a metal?

4. What shape is the "stationary" or "seat"? Does it have an o-ring around the outside which is in a groove (like the photo above)? Or, does the "stationary" or "seat" have a rubber piece that it fits into which is like a cup? So, the "stationary" or "seat" is either an o-ring mount or a cup mount type.