Tanks of these pressure vessels are made of steel. From 10 liters to 1500 liters these tanks are provided with EDPM membrane and from 2000 liters to 5000 liters they are provided with butyl membrane. The high strength construction of the tank, durable membrane and quality fittings makes it the best choice for critical applications such as fire fighting. They are pre-pressurized at factory and are tested along with fire pumps prior to dispatch.