Quote: Iana1212 wrote in post #15

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It is part of the brass fitting at the end of the hose just next to the threaded part that screws into the bottle. It is a small black button, I hadn't realised it was a button and had tried turning it but that obviously made no difference.

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Glad you got it going.

That's what Truma refer to as the' hose rupture protection button', which used to be green as Colin suggested.

Truma appear to have complete redesigned the way their regulators look, with lots of more 'modern' looking black plastic mouldings. It looks as if the green button has been reduced in size and is now coloured black. Not having such a van or been anywhere near a van dealership for at least 18 months, there hasn't been an opportunity to see the changes.