Lot to be said for Hutchwilco or Burnsco, I had a Hutchwilco that had been sitting forgotten in a locker for over 10 years without service. This was when the subject came up in a SSANZ discussion a few years ago, threw it in marina and it inflated immediately. I think that the bladders and mechanisms come from only a few suppliers, I really cant see the need for a manufacturers service as they are so simple, its basically blow them up and see if they hold air and weigh the cylinders. A visual once over and youre good to go.