On a slightly different note, many people report having to have the pigtail hose changed because of the date. I have just unexpectedly changed my van (due to a split in the front panel of my other one).
Anyway, when we collected the new van the dealer asked if I wanted to purchase a new pigtail. As the one on my old van was only put on new last year there didn't seem any point. So I reused the old one.
In our first trip away, on the second to last day I changed the gas over only to be greeted by a leaking sound when turning the adapter on.
A quick inspection showed that the o ring in the adapter was perished and split.
So when our diligent approved service folk service the van, they read the date on the hose, but in the 14 years I have had vans dealer and mobile serviced, I have never had anyone pass comment on the gas bottle adapter.
What was even more surprising was how difficult it was to buy a new one in the Scarborough region, I run BP gaslights (now flo gas) and they have a 27mm connection.
Tried everywhere in the area with, no luck,