Hey guys I'm putting back together my house I just got and im putting the original cast iron tub back in and the problem I ran into is I have cast iron piping that runs from under the house by about maybe 15ft to new pvc. My question is, is it ok to join pvc to a cast iron tub and then join it to the existing cast iron piping? If so how do I do this. Im not a plumber and well.. this is the only thing holding me up lol. Thanks!