This is the 18 litre high pressure model. Grundfos steel pressure tanks are designed for use with water to a maximum of 90 degrees C and are ideally suited and approved for use with drinking water. Our tanks can of course be installed with any Grundfos (or other brand) pump, are suited to vertical installation and, are supplied with a non-toxic butyl rubber diaphragm dividing the tank chamber into two compartments. The upper compartment contains compressed atmospheric air. The lower compartment has a liner made from polypropylene and is filled with water from the pump. Maximum operating pressure is 1,600 kPa and the inlet/outlet is 25mm male BSP thread. 5-year warranty. Click here to download the specifications and dimensions.