cast iron
I remember that too Cass. If you could lift one end up, you could walk it when it was still in the crate. And in the old days it seems that some of the plumbers would slide them from the truck and walk them to the house and if it was going on the first floor, walk them near the bathroom, take the wooden shipping crate off, and square them to the recess on the floor and push them into place and sit them on the 2" x 4" at the back wall and go from there. Once in a while you had to readjust that 2" x 4".