'Fountain gate' in the Bible

Then passed I over unto the fountain-gate, and unto the pool of the king, - but there was no place for the beast that was under me to pass.

And, the fountain-gate, did Shallun son of Col-hozeh ruler of the circuit of Mizpah, repair, he, built it, and covered it, and set up the doors thereof, the locks thereof, and the bars thereof, - also the wall of the pool of Shelah, by the garden of the king, even as far as the stairs that go down from the city of David;

and, over they fountain gate and straight before them, they went up by the stairs of the city of David, at the going up of the wall, - above the house of David, even as far as the water-gate, eastward.