Tube furnace work tube package for hydrogen atmosphere contains:
1)  Extended length work tube
2)  Insulation plugs suitable for horizontal or vertical use
1 x standard
1 x thermocouple access slot
3)  Work tube end seals:
1 x gas safety inlet fitting
1 x gas safety outlet + thermocouple gland
4)  Probe thermocouple access:
a: Up to 1200 °C:
Probe thermocouple gland complete with type N thermocouple
b: Above 1200 °C:
10 mm gland with PTFE seal and blanking plug to suit optional type R or B or 20/40 probe thermocouple assembly