Amazon.com: (Pack of 4) 2" Round (10-14 Ga 1.740"-1.830" ID) Black Plastic Tubing Plug, 2 Inch End Cap - Steel Furniture Pipe Tube Cover Insert | Fencing Post - End Caps for
Pack of 10) 7/8" Round Snap-On Plastic Tubing Plug, (14 - 20 Ga - 0.71" to 0.82" ID) - Furniture Chair/Leg Pipe Tube Cover Insert | Fencing Post Sliding Inserts - End
Caps for Plastic Tubes | StockCap PVC & Vinyl Caps
Plastic Round Cap Chair Leg | Round Plastic Pipe Stopper | Plastic Blanking Plug Caps - Furniture Accessories - Aliexpress
Tube Caps for Plastic Packaging Tubes and Containers
Amazon.com: EZends 1 Inch (10-14 Gauge) Polyethylene Square Tubing End Caps (10 PK) Plastic Plugs / End Caps / Plastic End Caps / Plastic Plugs for Square Tubing / Black Plastic Square Plugs / Cap Plug : Automotive
Plastic Caps and Plugs: Types, Materials, Applications, and Benefits
Caps and Plugs | Fastenal Canada
Plastic Tube Caps Plugs | Blank Plastic End Cap Pipe | Plastic Blanking End Caps - 20pcs - Aliexpress
End caps, plugs, tube inserts, hand grips | StockCap Australia
30mm Round Ribbed Push In Tube Inserts For All Tubular Legs