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ProVent Single Stack DWV Systems provides greater value at lower cost for three stories and above multistory apartment / hotel type DWV plumbing systems. Both labor and material costs are reduced by 30-40 percent and is faster and easier to install. The system works as well or better than any conventional two- or three-pipe DWV methods. ProVent offers free single stack riser drawings for contractors to compare the savings of the skilled plumber’s installation time.