Truck transport is mainly used for transport of refined products by road to their end destination, to a local supplier or customer. This destination might be a local fuel station storage tank, from where it is sold on to the public. Other larger users, like distributors and bunkering service suppliers, if not served by pipeline, might have fuel delivered by railcar tanks on a train, or by a ship or barge. A tank truck loading system is used to transfer the refined products into the road tanker, railcar, or ship’s tank: this is a custody transfer and so accurate metering is required. Any tanker loading system typically uses two hose connections - one to load the liquid product into the truck and another to recover and collect the fumes that come out of the truck as they are being replaced by the delivered liquid.