Urinals designed for females ("female urinals") also exist but are rare. Human urine can be collected with sanitation systems that utilize urinals or urine diversion toilets. Approximately 1,800 toilets and urinals are available today. Plumbing manufacturers often use the term "water closet" to differentiate toilets from urinals. The stadium contains 318 toilets and 260 metres of urinals. The restroom features four stalls, but no urinals. The toilet facilities for away supporters consist of open air urinals and Portakabins. Most water closets, bidets, and many urinals have the trap integral with the fixture itself. Flush urinals are nowadays rarely seen in Brisbane. These are called waterless urinals or flushless urinals. Each prisoner transport vehicle has two urinals and two water dispensers. Suppliers for waterless urinals can easily be found on the internet. Approximately of water a year are saved with the use of 249 waterless urinals. Female urinals and unisex urinals are much less common than male urinals. The urine collected from public urinals was sold as an ingredient for several chemical processes.