Im adding abathroom in basement and need some suggestions on how to tie into the old cast iron. There is a 4" cast iron cleanout in the slab. I have broke out the concrete and dug down around it, only to find right under the y there is 2 45's which head directly outunder the foundation. Im hopin to be able to tie into the cast under slab level as i do not want to put tub and toilet on platform. is there any way to tie into the cast when its all fittings? possible brake it in middle of 45 and use 4 1/2" - 4" fernco coupling?