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NIBCO 4 in. x 4 in. x 3 in. x 3 in. ABS DWV 45-Degree All Hub Double Wye C5834HD4433 - The Home Depot
Back to Back Toilets: Double Fixture vs Double Wye | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
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B&K Mueller - Drain, Waste & Vent 45 deg; Double Wye: 3″ Fitting, All Hub, Polyvinylchloride - 37006889 - MSC Industrial Supply
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Charlotte Pipe 4-in x 4-in x 2-in x 2-in PVC DWV Reducing Double Wye in the PVC DWV Pipe & Fittings department at Lowes.com
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