All businesses tend to have a ‘private’ language. This is a collection of, often technical, terms whose meaning is instantly clear to the experienced people who work there. They, therefore, use these words automatically – often confusing others.
One term we use here – and have been asked about by customers – is ‘backflow preventers’. These are devices that are installed into water pipes to stop – well – backflow! It means, for example, that contaminated water can’t flow back into your drinking water. So, water flows in only one direction.