"i read the reviews on here and was surprised that this product was not compatible with the rothenberger torch. never mind i thought, cos i have a go-gas one. immagine my surprise when i got home to find that the go-system gas dont work on the go-gas torch. call that a system>>>>????? i checked the bumph on the screwfix sight and lo and behold i find---" For use with Go-gas MAP/Pro or Propane cylinders.". go-system is the gas made by go-gas ltd. of stockport. i'll be chatting to screwfix in the morning regarding my wasted time and fuel."