The Drum Trap.—The drum trap is used under sinks, baths, showers, and trays.
CHAPTER VII
Laying Terra-cotta and Making Connections to
Public Sewers. Water Connections To
Mains in Streets
TERRA-COTTA PIPE
One of the first pieces of work which a plumber is called upon to do, when building operations commence, is to run in the terra-cotta sewer from the street sewer into the foundation wall.
When the street sewer is laid, Y-branches are left every few feet. A record of the branches and their distance from the manhole is kept generally in the Department of Sewers or Public Works. Therefore, the exact measurement of any branch can be obtained and the branch found by digging down to the depth of the sewer. A branch should be chosen so that the pipe can be laid with a pitch, the same way as the main sewer pitches. This can be done by getting the measurements of two of these branches and choosing the one that will serve best. When there is a brick sewer in the street and no branches left out, the sewer must be tapped wherever the house sewer requires it (see [Fig. 35]).