Welding with nitrogen gas creates the strongest welds possible because it eliminates oxidisation of the plastic during the welding process.
Model 92452 has it's own nitrogen generator which eliminates the need for a gas bottle.
Model 92446 uses a nitrogen gas bottle (not included).
‣Allows the welding of filler material by heating with nitrogen
‣The welder comes complete with a set of plastic consumables including a scraper and roller to finalise the repair.
‣Heats plastic without combustion and therefore without emitting fumes: 230v, 50Hz, 1600w, 20-650°C Made in Italy for Power-TEC.

The nitrogen welder range from Power-TEC —

— create the strongest welds possible because nitrogen eliminates oxidisation of the plastic during the welding process.