Serenity Drains Underbody (For Molded Bases) Model BCS.18 Drain Underbody for Molded (preformed) Bases (For Top Models 100 & 150) only. Specifications Features Downloads & Certification Description PVC Underbody with 2" ABS/DWV Hub Connection Features Includes a 2" x 1-1/2" Reducing Bushing Downloads bronte-BCS.18-Specification-Sheet.pdf Certification Shop