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Amazon.com: 2 Pieces PVC Bulkhead Fitting for Rain Barrels, Aquariums, Water Tanks (3/4 Inch) : Patio, Lawn & Garden
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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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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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