I changed the flexible cooker hose on my boat for one of those shown in Yngmar's web site link, and where the old hose was found to be very badly worn due the gimballing action of the cooker while the boat was at sea causing the rubber hose to rub and chafe against the boat side. It had seen about fourteen years of service on an ex charter boat by then. The hose within the gas bottle storage locker remained in good condition, but now that you have mentioned it may have an expiry date, I'll take another look at it. Thanks guys.