Vent Systems 6" to 5" Inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC Ventilation Systems, ABS Plastic PVC Pipe 150 to 125 mm - - Amazon.com
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MECCANIXITY PVC Rigid Round Pipe 45mm ID 50mm OD 350mm Dark Grey High Impact for Water Pipe,Crafts,Cable Sleeve: Amazon.com: Tools & Home Improvement
2" Inch to 1-1/2" Inch reducer pvc fitting. Multi-purpose eccentric pipe/duct coupler/reducer - vent/drain vent/sewer/condensate. Two side rubber push-fit socket. For work above soil. - - Amazon.com
Amazon.com: PureSec 15ft Red 1/4 Inch O.D. RO Tubing at 70°F-120PSI to 150°F-60PSI NSF Certified CCK 1/4" Flexible water pipes 1/4-inch Plastic Tubing(5) : Industrial & Scientific