We have a metal drain (overflow) pan that needs replacing. There is no apparent way to remove the pan. There is no threaded connector. It appears to have a PVC pipe coming up through the floor in the center of the pan & a ring/washer that is seeming attached to the pan and holding it in place. I have tried pulling the ring off but it will not budge. What am I missing?

What model is the machine. Give us the model and model number and describe the machine: top loader or front loader.

What model is the machine. Give us the model and model number and describe the machine: top loader or front loader.
My question is only about the metal overflow pan thr sits under a watching machine. There is no washing machine in the laundry room right now.

Cut out the drain connection with a bi-metal hole saw in a drill. Remove the pan and then come back and tell us about the plumbing connection.

It the pan is aluminum you can cut out the drain connection with an old wood chisel. If galvanized you can still cut out with chisel but will take longed. Will ruin chisel.

Then you would have to ask the builder. You can buy these at some supply houses. It's possible to get a plastic one that would fit inside the metal pan. My guess is that they glued it to the floor and the PVC is attached with glue. If the PVC is the only thing holding it then you take a Dremel tool with a saw blade and cut the PVC as high up as you can. Then you can trim away the fitting and replace it. No matter how it's attached you will have to cut the pipe with a Dremel tool.

Then you would have to ask the builder. You can buy these at some supply houses. It's possible to get a plastic one that would fit inside the metal pan. My guess is that they glued it to the floor and the PVC is attached with glue. If the PVC is the only thing holding it then you take a Dremel tool with a saw blade and cut the PVC as high up as you can. Then you can trim away the fitting and replace it. No matter how it's attached you will have to cut the pipe with a Dremel tool.
I will try chiseling the connector ring off the pan & PVC pipe. The pan is over carpet so not glued to floor uay

That may work but will give a ragged cut.

That may work but will give a ragged cut.
Well as is turns out nothing was sealed, glued or water tight for that matter. Once I began banging on the connector ring it became apparent that I could just wiggle the whole thing off.

Now for the next step: Installing a new overflow pan. (First I am going to remove the carpet & padding, reinforce with another sheet of plywood, install vinyl & then install a new overflow pan.) The plumbing is a PVC Pipe sticking straight up from the floor so middle of the pan.

Great! It's good when things work out that way. Sometimes you just have to get in there and get your hands on the thing to find out what to do. Good luck with the repair and don't buy a front-loading machine.