The waste valve bodies alone without a hub or spigot connection are something you can get. You would need something like the Valterra Waste Valve Bodies w/ Flexible Cables for RV Black Water and Gray Water Tanks - 72" # TC1372 for both tanks or the Valterra Waste Valve Body w/ Flexible Cable for RV Black Water Tank - 72" # TC372 for the black water tank only. There is also the Bristol Waste Valve Body for RV Black Water with Seals and Hardware - 3" Diameter # 34439240 which does not have... view full answer...