Nozzles and safety

As of now, type approval certificate has been given to CNG vehicles fitted only with nozzles meeting New Zealand Standards NZS. These are prone to frequent o ring failures an item in nozzles. We are informed that they occur on an average about once every 20 fills. This failure not only interrupts fueling and requires replacement of the oring, it also creates a fire hazard due to the release of a significant amount of high pressure gas.