I tore a neck seal on my Waterproof drysuit while gearing up yesterday. I had never changed a neck seal on this suit before but it took less than a minute to do so. I pulled the torn seal off the ring and popped the new one in using my thumb rather than the tool that comes with the seal. My thumb was much faster. With my old DUI suit I had to use a coin to remove both sides of the seal and apply soapy water to install a new seal. Of course, my older suits required glue, heat gun and rollers to repair so I'm much happier now.
