My understanding is that from 2006, a year later than in the UK, all EU vans should be fitted with a 30 mb butane/propane regulator. However, i believe some systems allow this to be fitted directly to the cylinder and use low pressure hose to the caravan system.
My own continental van was made in 2005 and indeed came with just a hose nipple. I had a 30 mb bulkhead regulator fitted as i did not wish any 'complaints' from UK servicing companies, and trying to explain the difference in dates would have be just too much bother.