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Amazon.com: LIFEGARD Aquatics Double Threaded Bulkhead Kit for Fish Aquariums – High-Impact Resistant PVC – Includes Bulkhead Fitting, Gasket, Lock Nut – Jet Black – 1 Inch : Industrial & Scientific
Hayward BFA1040TES Hayward Bulkhead Tank Fitting: 4 in Pipe Size, FNPT x FNPT, 5 3/4 in Required Hole Size, EPDM Gasket BFA1040
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Amazon.com : Outus 2 Pieces PVC Bulkhead Fitting with Plugs for Rain Barrels, Aquariums, Water Tanks, Tubs, Pools (3/4 Inch+4 mm Thick Silicon Seal Gaskett, Dark Grey) : Patio, Lawn & Garden
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Amazon.com: PVC Bulkhead Fitting Double Threaded Bulkhead Water Tank Connector for Rain Barrels, Aquariums, Water Tanks, Tubs, Pools, Spigot, Black, 3/4 Inch Male 1/2 Inch Female (4 Pieces) : Industrial & Scientific
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Proline Series 3/4-in x 3/4-in Threaded Female Adapter Union Fitting in the Brass Fittings department at Lowes.com
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