16mm，19mm，22mm，25mm，. Ideal for keeping water and dirt out of tubes to help prevent rusting on the inside. Ribbed design for easy assembly and secure fitting.
eBay
Brass Threaded nut inserts M2 M2.5 M3 M4 M5 M6 M8 T-type Copper 3D Printing Injection Embedment Molding Flange Heat Insert nut
Aliexpress UK
I0.1117sNBSsNBSFT" style="box-sizing: border-box; -webkit-tap-highlight-color: transparent; outline: 0px; margin: 0px; padding: 0px; height: 6770.92px; position: absolute; top: 0px; visibility: hidden; width: 1053.85px; z-index: -1;">.
eBay
Brass/Copper Heat-Set Threaded Insert Nuts M2 M2.5 M3 M4 M5 M6 | 3D Printer Thermal Inserts | 304 Stainless Steel Phillips Screw
Aliexpress UK
Size:12~74mm. -Application: This product is suitable for stainless steel pipe, aluminum pipe, iron pipe, galvanized pipe, square tube, copper pipe, etc. Blockage of various stainless steel products, including furniture, stainless steel doors and other stainless steel decoration.
eBay
16ER AG60 H01 16IR AG60 H01 Thread Turning Tool Aluminum Insert CNC Turning Insert High Quality Cutting Thread Metal Lathe Tools
Aliexpress UK
Rib Design - The rib design ensures a firm grip on the inside of the tube. The bottom of the pipe plug is thick, which is impact and abrasion resistant. Easy to use - These square tube end cap plugs provide a neat and secure finish to the tube ends, preventing dirt and dust from entering.
eBay
DIY Book Nook Kit 3D Wooden Puzzle Bookshelf Insert Decor with LED Light Mini Dollhouse Model Kit Insert Bookend Building Kit
Aliexpress UK
Simply cut a thin strip of paper and wrap it around the tube housing, ensure it is tight then put a mark where it crosses the starting edge of the strip underneath it. Durable, flush-fitting end plugs designed to seal the ends of round tubes and pipes.
eBay
1pc Beautiful Metal Ground Insert - Perfect for Outdoor Christmas Decor, Easy to insert into the ground to add to your garden
Aliexpress UK
eBay
5~50PCS ABS Round Tube Plastic Hollow Tube Diameter 2/3/4/5/6/8/10/12mm DIY Handmade Sand Table Material Model Building
Aliexpress UK
Feet Covers. -Uses: table and chair furniture, table and chair feet, square pipe wall, pipe plugs, etc。. -Anti-skid and noise reduction: the pipe plug plays an anti-skid and noise reduction role while protecting the object。.
eBay
Red copper Tubes 1-16mm Internal Diameter 300mm/200mm/250mm Tube Brass Spacer Model Building diy toys accessories
Aliexpress UK
Colour: Black.
eBay
Audiophile High-power Tube Power Amplifier Wireless Bluetooth HIFI Mini Tube Power Amplifier Amp Optical Fiber Coaxial Interface
Aliexpress UK