Maybe https://www.wickes.co.uk/Wickes-Compression-Blanking-Cap---22mm/p/424952
Or https://www.screwfix.com/p/bsp-female-cylinder-blank-1-x/21851
Good spot. I'd searching for blanking nut as that is what all the other sizes were called.
Actually it's a 3/4 now I've checked the bsp spec. How lovely and confusing.
Pipe specs are complicated and I don't really understand them but does 3/4" BSP refer to the internal pipe diameter?
@root started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Maybe https://www.wickes.co.uk/Wickes-Compression-Blanking-Cap---22mm/p/424952
Or https://www.screwfix.com/p/bsp-female-cylinder-blank-1-x/21851