Emco Wheaton's Posi/Lock Blue delivers safe, spill-free dispensing of Urea. A no-spill connection provides for a clean working environment and unmanned filling, allowing the operator to do other duties. Posi/Lock Blue is also lightweight and incorporates automatic shut-off using vacuum technology, which ensures the tank is always filled to 90 percent of its capacity. Posi/Lock Blue It is particularly targeted at the bus transit companies where vehicles are being refueled at the same location every time.