Y-fitting

Y-fitting, wye fitting

A pipe fitting, 1, one end of which subdivides, forming two openings at an angle, usually 45° to the run of pipe.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Begin the drain system by cutting into the main line (Photo 2) and splicing in a Y-fitting (Photo 3).
Plumbing a basement bath: installing the drain system is a big job. The DIY savings are even bigger
In the drain system, use a Y-fitting to connect horizontal pipes (Photo 3, p.
Plumbing Q & A
Where the tube passes by the downspout from the gutter, we installed a Y-fitting and drained the roof water from the gutter system directly into the main drainage line.
Better yard drainage

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