Eribafolk Facebook Member Paul Luty posted this today so I thought I should share it.

Paul Luty:-
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A cautionary tale - We’re having our first trip away this year to Pembrokeshire and after the usual set up, turned the gas on to make a brew and instantly smelled gas. After much checking and tightening (with borrowed spanners) discovered that the Gok regulator on my 2 year old 540GT merrily venting from the left diaphragm. Luckily I managed to get a replacement quite near by and the replacement has fixed the issue…. But recommend that everyone carries the correct spanners (worth checking in situ as it’s a tight space) and a PZ2 screwdriver. Here’s the offending part-

Gas.jpg - Bild entfernt (keine Rechte)

John England replied thus:-

John England
The yellow caps on Truma/Gok 2-stage regulators are over-pressure release valve and will rupture if there's an internal fault to prevent high pressure from the cylinder entering the caravan's low pressure pipework and appliances.
These regulators are prone to failure and during a busy caravan season I get called out regularly to replace them.
I prefer to fit the equivalent Cavanagh regulator which are also 2-stage, and with the same flow rate of 1.5kg/h, but infinitely more reliable - and furthermore, half the price of the Truma.