• A specialised tool, used to assist the extraction of the copper washers
  used to seal diesel injectors where they enter the cylinder head.
• They are so deep into the cyliner head and usually stuck tight with
  carbon build-up that extraction is usually next to impossible.
• Commercial vehicles used.
• These sealing washers sit at the  bottom of the injector orifice and are
  a common failure point.
 

• A specialised tool, used to assist the extraction of the copper washers
  used to seal diesel injectors where they enter the cylinder head.
• They are so deep into the cyliner head and usually stuck tight with
  carbon build-up that extraction is usually next to impossible.
• Commercial vehicles used.
• These sealing washers sit at the  bottom of the injector orifice and are
  a common failure point.