A big burner from Sievert shown next to a Primus 00 Burner, the flame tube has several flaws in the cast iron so i have made one from 4 inch Stainless steel exauhst pipe. The jet bore looks bigger than 0.60mm but not sure of the size yet. The thread is 17mm and fits my Optimus 529, i believe this is the same size burner as used on the Optimus 530. Heats 50L of water in 19 mins
