New Defender's Study Bible Notes
18:17 Rab-shakeh. These names are actually titles. Tartan, Rabsaris and Rabshakeh mean, respectively, “Tribute Officer,” “Chief Eunuch” and “Chief Butler.”
18:17 conduit of the upper pool. Ironically (or providentially), this was the same location where Ahaz had received, and then ignored, the testimony of the prophet Isaiah some thirty years before, even including the great promise of the coming virgin birth of the Messiah, Immanuel (Isaiah 7:3,10-14).
18:17 fuller’s field. The field where cloth was cleaned and bleached.