Amazon.com: 12Pcs 3/4" Inch Round Plastic Plug, End Caps for Tubing Pipe with OD 20mm 0.75" (not ID), Steel Furniture Foot Table Chair Leg Blanking End Insert Plug Cap Cover : Everything
Amazon.com: Prescott Plastics 1" Inch (25.4 mm) Round Plastic Hole Plugs, Inserts, Black End Caps for Metal Tubing, Hardware Plug, Fences, Glide Protection from Chair Legs and Furniture - Pack of 4 :
Round Plastic Blanking End Caps Pipe Tube Inserts Plugs Bungs / Black 12 to 76mm | eBay
PVC Cap End Caps Plug Blanking ø20mm~160mm Blue Adhesive Drain Pipe Fittings | eBay
PD® Lamellar Plug Round 40 mm for Round Pipe - Round End Caps Made of PE Plastic - Pipe Plug 40 mm for Pipe Covering Steel Tube, Stainless Steel Tube, Aluminium Pipe
Caps | Caplugs
2-1/2" Round Cap PLUGS-1404 (14-18G 2.34" to 2.40" ID - 2.5 Inch OD
Tapered Polyethylene Plastic Plug Caps with Dual Function Closures - Manufactured by MOCAP
End caps, stop ends & plugs | Pipe fittings | B&Q
End caps, plugs, tube inserts, hand grips | StockCap Australia