'Fountain gate' in the Bible

I crossed over to the Fountain Gate and to the King's Pool, but there was no place for {my mount} to cross over.

Shallun son of Col-Hozeh, the commander of the district of Mizpah, repaired the Fountain Gate. He rebuilt it and covered it and erected its doors, its bolts, its bars, and [he built] the wall of the Pool of Shelah of the king's garden, right up to the steps going down from the city of David.

At the Fountain Gate opposite them they went up the steps of the city of David, at the assent to the wall, over the house of David, and up to the Water Gate to the east.