The 5000 & 6500 vertical cylindrical above-ground tanks are primarily intended for water storage for fire protection systems. The vertical cylindrical tanks are designed for above-ground installation, at atmospheric pressure and fluid temperatures in the range of 4-45°C. The delivery package includes: tank, lid and gasket for lid sealing, air vent valve. Material: The tanks are manufactured from UV-stabilized polyethylene class 8. Coloring is done with organic (alpha)-stabilized pigments certified for food use, with good resistance to light, UV radiation and temperature. Structure and color: single-layer, blue. Lid: DN 400 PP, threaded, black, equipped with air vent valve and gasket. Manufactured with connections: – 2 x 2″ at the bottom – 1 x 2″ at the top. The connections are reinforced. Drilling of connections is done only with milling cutters, the milling cutter size corresponding to the 2″ connection is 51-57 mm. Connection to the tank through metal fittings/inserts or nipple-nut kit is done only with flexible tube/hose. – The tanks have not been designed and CANNOT be used for pressures below or above normal atmospheric pressure (cannot be used for pressurized or vacuum storage). – The tanks have not been designed and CANNOT be used for fuels or other petroleum products as well as for chemically aggressive substances (acids, bases, etc.).