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The ProVent Single Stack DWV Systems are for three stories and above multi-story apartment / hotel type DWV plumbing systems. The product helps reduce both labor and material costs by 30-40 percent, and is fast and easy to install. The system works as well or better than any conventional 2 or 3 pipe DWV methods. It also offers free single stack riser drawings for contractors to compare the savings of the skilled plumber’s installation time.