Long pipe larger the better in diamiter (got mine for scrap jard)
Gas fittings for tube and to your gas bottles
2m drill bits
Step 1: Drilling the holes
Measure out 2m hols every 1.5cm along your pipe, make sure to leave a few inces from both ends of the pipe.
Clean up holes with meetle file.
When drilling such small holes you should poor some wanter on drill bit it makes such a difference.