While two Nuts & Seals are provided to connect to Overflow Tube and Drain Ell, American Standard instructions recommend connecting the Tail Piece of this product to inside thread of the Drain Tee using sealant.  This is not only insufficient from a plumbing perspective, but from a leak-free performance for the life of the tub!  It is particularly susceptible to failure when a full tub is suddenly drained.  An additional Nut & Seal is required to connect the Tail Piece with the Drain Tee.  I bought this separately at HD - product numbers: HD7197C (slip) and HD8031C (Nut).  Would have given 5 stars but for bad design.