Rosenwach Tank has manufactured, installed and maintained water towers for New York's building for over a century. New York, which has thousands of cylindrical wooden rooftop water tanks with conical roofs, couldn't exist without them. Rosenwach Tank was one of the first to innovate tanks into which water from the city water supply, which only rise to the sixth floor of a building, is pumped to the roof and by way of gravity then provides sufficient water pressure to supply all floors. Rosenwach has built and installed well over half of the city's water tanks.