It's the one in the blue box with all the different attachments. I have everything but the instructions. So this is to anyone who may hold on to the good old reliable tools. I have used this torch all my life and the other day it started sputtering. Dirt I'm sure. I took it apart and blew it out with air. So when I put it back together there is a small mushroom shaped piece that goes next to the valve or the nozzle, I'm not sure which and wonder if anyone can tell me.