Drain help for new acrylic shower install

[Amoreena]

Hi! I've just removed my old leaking tile shower and want to replace it with an acrylic shower unit. Can anyone tell me what type of drain I have left here, and what to remove/how to connect a drain for an acrylic unit to it? I'm on a concrete slab, and I think this drain is cast iron, as the house is about 30 years old. Thanks, Amoreena

[hj]

It is hard to tell with the mortar still attached to the drain fitting, but it appears to be a cast iron unit. That has little relationship to the type of pipe, however. It is either screwed onto the riser pipe, or attached to it with a lead, or rubber joint. We cannot tell which of the above applies to you or the best way to remove it since each type of pipe and attachment requires a different method.