Fixing leaks to pipes under sink

• https://homeguides.sfgate.com/fix-pipes-come-loose-under-sink-31304.html
• https://www.hunker.com/13417096/how-to-install-slip-joint-washers-in-plumbing
• https://youtu.be/1b0asFPDzfA
• Notes:
  • you need a rubber gasket (= washer in UK)
  • for your slip joint nut (= compression joint in UK)
    • 1.5” / 40mm
  • and a nut
  • and maybe a length of pipe (also 1.5” / 40mm).