Amazon.com: (Pack of 8) - 1 1/8" (14-20 Ga - 0.96"-1.05" ID) Round Black Plastic Tubing Plug, 1 1/8 Inch End Caps - Steel Furniture/Fencing Post Pipe Insert | End Caps for Fitness Equipment. : Industrial & Scientific
Value Collection - Pipe End Cap: 1/8″ Fitting, 304 Stainless Steel - 45268802 - MSC Industrial Supply