Had a job a little too big for my small 'B' sized portable torch kit. I was going to borrow my Dad's torch set that he hasn't used in 20 years to find that his tanks are empty (and expired) Go to gas supplier, he says oxygen tank is no good (visible pitting on outside of tank). I
ended up buying a tank of oxygen from him and then a propane cutting tip to fit my torch. Came home, assembled everything, and couldn't make it work. Sat down, Googled and YouTube'd some oxy-propane cutting information and 5 minutes later I'm slicing 1" plate like a knife through hot butter. It took me a bit to get the flame right and then figure out the best technique, but overall I'm happy with the setup. I'll probably buy a couple more tips in different sizes to keep in my toolbox for different applications. He sold me a size 3 today for my torch.