Our 900 mm nickel tipped thermocouple lasts longer than the un-tipped type but until now it has not been possible to extend to extend its length. We now offer the extended version which consists of the two 900mm sections and jointing barrel. It consists of: 900 mm nickel tipped long life universal thermocouple 900 mm extension with M8 end M8/M8 joint connector these parts are ideal for SIDE mounted DON or Oilwarm type conversions.Suitable LPG or natural gas.Please note we sell universal thermocouples which sometimes may need an additional fitting - Gas Aga range cookers and Rayburn range cookers have used many different pilot assemblies and valves in the last 42 years. We cannot guarantee ours will fit in every case and you may have to re-use some of the fittings from your existing thermocouple. For example the previous split nut.Note. Should only be installed by Gas Safe (previously CORGI) registered gas engineer.