Chapter 8 of the Suwen: The San Jiao

三 焦 者 ， 決 瀆 之 官 ， 水 道 出 焉 。

In reference to the San Jiao, it holds the office of Lifting the Fluids from the Waterways. The Dao of Water emerges from it.

It is interesting to note here that the character jue, 決, has the radical, guai, 夬, within it. This is the name of Hexagram 43, that goes with the Stomach. The name of this hexagram is “Breakthrough,” and it is a picture of a lake that has risen to Heaven. The meaning of Jue is to “breach,” or “to dig,” but with this Hexagram, we can see that it has some meaning of lifting fluids up.
The next character, du, 瀆, is made of the radicals for water, net, cowrie shell (money) and chu, 出, “to emerge.”  This could possibly have the meaning of waterways where cowry shells could be collected in a net. Because cowry shells are very valuable, we can think of these waterways in the body as the most precious of all.
The Dao of Water emerges from the Triple Warmer. It must be noted that in Chapter 12 of the Lingshu, the Small Intestine is also said to have the Dao of Water emerging from it, and in various chapters of the Suwen, the Bladder is said to have the Dao of Water emerging from it. This line shows a direct correlation between the Small Intestine, the Bladder and the San Jiao. The San Jiao stands on a Water branch, and so the connection with the Bladder can be seen there.