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Charlotte Pipe 4 in. x 3 in. PVC DWV Adapter Coupling PVC001170800HD - The Home Depot
NDS PVC S&D Increaser/Reducer Coupling, 3 in. Hub X 4 in. Hub 4P07 - The Home Depot
ERA PVC PIPE SYSTEM DRAINAGE FITTINGS II-LIFTING LUG DIN STANDARD BS1329 BS1401
White PVC S Shape Connector Water Drain Pipe Fitting ID 50-110mm Tank Aquarium | eBay