I am nealy complete with the demo work for a tub to shower remodel. The remo will include the entire bathroom, walls and ceilings. Next step is to remove the tub. I have located the area to access the plumbing. The water lines I can deal with but, I do not know what to expect with the drains. The house was built late 60's possibly early 70's. Can anyone please shed some insight as to what I will be dealing with. I have no wires so now I am lost. Thanks in advance for any and all help with this endeavor.