The tanks are manufactured here in Italy using a 34CRMO4 steel alloy to give high resistance qualities yet reduced weight. They are externally treated for marine environments and protected with a zinc coating and painted with 3 layers of epoxy paint. Internally the tank is phosphatized and treated with silica gel at assembly. The tanks are white according to the ADR specifications. All tanks conform to TPED 99/36/EC regulations. The tanks come with valves manufactured by Sanosub and are TPED 99/36/EC approved. They have an oxygen UNI EN 11144/2 connection and come with an adapter for the use of a regulator with a DIN 5/8 attachment. All come with complete regulatory compliance documentation and certification.