G., of Boston, writes:

"Will you tell me what is generally used for house connections on what is known as a separate system of pipe sewers; I mean whether Y or T connections are generally used, and why one has the advantage over the other ? I have generally understood that a Y branch is not so liable to clog as a T, but I heard lately that a T makes a better connection. Do you know of any sewerage system where house connections have been made with T branches ?"

[For pipe sewers the general practice is to use Y branches, as offering the least resistance to flow and possible clogging. The best practice contemplates the use of a one-eighth bend, with the Y branch, the same as in house drainage. On large brick sewers in the combined system T connections are often used.]