I am putting a mop sink in a mudroom/laundry room which I am having remodelled. The mop sink is pre-cast terazzo (cement and marble chips) from Stern-Williams. It comes with a drain body cast integral, which is designed to be connected to a three inch cast iron drain pipe via a lead caulk joint. The contractor who is doing the install is balking at this. He was planning on using an ABS plastic drain pipe, which I think is OK for this since rthere is only crawl space beneath.
Does anyone have any idea how this can be connected to ABS drain pipe? The integral drain is basically a piece of brass pipe, smooth on the inside, with the bottom cut flush to the bottom of the mop sink. There is no flange or threads.