How to replace an exterior drain
I have an exterior drain in a stairwell that has broken out of the cement. It had a stand pipe. All I can find about 7" below the cement is a cast iron p-trap. and remnants of clay tile in the excavation of the dirt. The ID of the trap is 5" so I will have to nestle a short length of pipe and join it to a new drain. Can I use PVC? How would I join it to the p-trap? I’ve just carefully excavated and cleaned out the trap to make sure it was running to the cistern in the back yard.