single-stack system

one-pipe system

A plumbing system in which a single pipe carries both soil and waste.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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"A number of options were reviewed, including the option of installing a new two-high stack battery handling system that would replace our previous single-stack system," says Mike DeMattio, Nestle's Northeast area fleet manager.
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