GGWW 5pcs/lot Silicone Blanking Cap Intake Vacuum Hose Tube End Bung Inner Diameter 4mm To 25mm End Cap (Color : ID 10mm (5pcs)) : Amazon.co.uk: Automotive
Blanking Plugs - BLA052
Plastic Blanking Caps for male threaded sockets | Tek-Tanks
Brass Blanking Plug 3/8" NPT | Car Builder - Kit & Classic Car Parts Specialist