For some time we have used 1 red bottle and 1 blue bottle of gas in the front locker,kept thinking I will change the blue for red,but then it meant new pigtail and the spanner to change bottles.Anyway looked at our rubber hoses at the weekend and the date on them was 1991,so they had migrated with us each time we changed the van.I found a company called "Continental" based in Norfolk that supplied 2 new stainless steel pigtail hoses with handwheels to connect to the propane red bottle,and they delivered them to me the day after placing order, they are claimed to have 20 year life.Really pleased with the service and we now have 2 red bottles that can be changed without a spanner. Might be worth having a look at the date on your hoses next time you are in the gas locker.