Serenity Drains Underbody (For Molded Bases) Model BCS.20 Drain Underbody for Molded (preformed) Bases (For Top Models 100 & 150) only. Specifications Downloads & Certification Description Brass Underbody with 1.5" Copper/DWV Hub Connection Downloads bronte-BCS.20-Specification-Sheet.pdf Certification Shop