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Amazon.com: (Pack of 10) 2" Square Tubing Black Plastic Plug,2 Inch End Cap 2"x2" 2x2 Fence Post Pipe Cover Tube Chair Glide Insert Finishing Plug : Industrial & Scientific
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Amazon.com: eSource 1.5” Square Plastic End Caps, 24 Pack, Black Plug Inserts for Chair Glides, Metal Fence Posts, Pipe and Tubing, & Exercise Equipment, Furniture Table Legs, Truck Racks, 1 ½ inch :
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Hillman 2-Pack 1/2-in x 1/2-in Black Plastic End Caps in the End Caps & Screw Protectors department at Lowes.com
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Square Tubing Caps 3" Plastic end caps for square tubing 3x3 8-14 Plug tube end caps - 2 - Walmart.com
Threaded Tube Inserts | Threaded Square Tube Inserts | Square Tube Threaded Inserts | Threaded Tubing Inserts | Threaded Pipe Inserts | Square Thread Inserts | Essentra Components US
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