Envirowater's Free Flow Valve from, (Winner in the Cummins Environmental Gateway 2017 and Winner of the Royal Bank Of Scotland Go Green Challenge and now tested, recommended and endorsed by RBS) is a revolutionary but simple, retro-fit, water free urinal system that will save water, prevent bad odours and reduce your costs. Each valve fitted to your existing systems will save 100,000 litres of water, per urinal, every year.