Be it intentional or accidental, your inflatable Mustang Survival M. I. T. 100 life jacket was put to the test. While it's lovely the PFD worked, you need to re arm your M. I. T. 100 with the Mustang Suvival Re Arm Kit for M. I. T. 100 Inflatable PFDs. By replacing the spent CO2 cylinderbayonet assembly and bobbin too, if you have an automatically inflating life vest you'll enjoy being on the water knowing your PFD will inflate when asked. The kit includes everything you need: a new CO2 cylinderbayonet assembly specific for the M. I. T 100 PFD, a new bobbin, and instructions. You do need to read the instructions to ensure your safety on the water, at the very least. Follow the directions and you should be in business. Worried about your ability to stay within the lines' Pick up an extra kit so you can test your skills by inflating the M. I. T. 100 in your living room no, you should not be wearing it when you test it out.