'Fountain gate' in the Bible

Then I went on to the fountain gate and to the king's pool, but there was no place for the beast that was under me to pass.

And Shallun the son of Col-hozeh, the ruler of the district of Mizpah, repaired the fountain gate. He built it, and covered it, and set up the doors of it, the bolts of it, and the bars of it, and the wall of the pool of Shelah by

And by the fountain gate, and straight before them, they went up by the stairs of the city of David, at the ascent of the wall, above the house of David, even to the water gate eastward.