Have a upstairs bathroom . The floor is pored concrete. This home is the second home in Piqua ohio to have electric. The bathroom is over the intrance way of the home. I have knocked out the celieling which is very old plaster, and found the line from the shower and sink goes to a trap , I think and them goes to the toilet. It is leaking in the trap or where the sink and shower meets befor the toilet. Its is the old black pipe, not sour how to put new back and what to use. And the old trap,or the connesction where the sink and shower come to gether has a split where they conect to both right in a floor joice. how to fix