I am installing a decorative bathtub drain kit. The kit comes with Schedule 40 PVC, but the rest of my drains are ABS. How do I connect these? I've seen the all purpose cement, but heard that that doesn't meet code. Do I need to use a no-hub connector thus making my p-trap connection further down? With this, the p-trap will probably be below the ceiling level of the floor below. How is this typically done?