Conduit

Boyd’s Bible Dictionary:

(wit) (conductor). A water pipe or aqueduct ({vi 10042;10119}2 Kings 18:17; 20:20; {vi 17786;18333}Isa. 7:3; 36:2); ditch (Job 38:25).

Concise Bible Dictionary:

Inside Hezekiah’s Conduit
Channel for conducting water. There are still the remains of one that conveyed water from what are called Solomon’s pools to Jerusalem. We read that Hezekiah by means of a pool and a conduit brought water into Jerusalem (2 Kings 20:20; compare also 2 Chron. 32:30). Efforts are now (1894) being made to bring water to that city by the old conduits.
Copy of a plan of Palestine water conduits (1934-1939)