The connector is not dependent on any tray material. As long as the shower drain fits outside the associated pvc drain pipe, the connector fills the gap to create a water tight gasket seal.
Just follow included directions. They slide over pvc drain pipe and wedge between pipe and drain spout. Use a small amount of dishwashing soap if neededyo ease installation.
I installed this around a pvc drain pipe. I would think this would work for case iron also.
Please contact Fernco Customer Service with specific dimensional information.