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Amazon.com: Prescott Plastics 1 1/4” (31.75 mm) Square Plastic Plug Insert, Black End Cap for Metal Tubing, Fences, Glide Protection for Chairs and Furnitures (10 Pack) : Industrial & Scientific
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Square Pipe Cap | Pipe End Caps | Insert Plugs | Furniture Legs - Square Tubing Pipe End - Aliexpress
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Made in USA Prescott Plastics 1" Inch Square Vinyl Plug Insert, Rubber End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furniture - Pack of 10 - - Amazon.com
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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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