Amazon.com: Prescott Plastics 0.875 Inch Square Plastic Plug Insert, Black End Cap for Metal Tubing, Fence, Glide Insert for Pipe Post, Chairs and Furnitures (10 Pack) : Industrial & Scientific
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Plastic 1-1/2 inch White Square Tubing Cap, Finishing Plug, Pipe Tubing End Cap, Durable Chair Glide Universal - 4 - Walmart.com
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Anti-uv Custom Plastic Tubing White Plastic Box Section Plastic Square Tube Pvc Rectangular Section For Framing Using - Buy Square Plastic Pipe/ White Anti Uv Pvc Square Profile Pipe/plastic Section Box/square Tubing/plastic
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Prescott Plastics 1 1/2” (38.1 mm) Square Plastic Plug Insert, Black End Cap for Metal Tubing, Fences, Glide Protection for Chairs and Furnitures (4 Pack) - - Amazon.com