Steve [Masters] is holding a "Flare" which is used to see any scale left on the boiler, and so this is inserted through a Plug hole or Mudhole door and enables him to see inside the boiler.
Steve [Masters] is holding a "Flare" which is used to see any scale left on the boiler, and so this is inserted through a Plug hole or Mudhole door and enables him to see inside the boiler.
Credit: Chris Perkins, 16 April 2005