Industrial Nitrogen Gas(Purity: 99.97%) As Per Is Spec. No: 1747/1972 With Amdt. No: 1(Reaff Irmed-2003). The Volume Of Nitrogen In Each Cylinder Should Have 7.0 Cubic Metres And To Be Supplied 8 C Ylinders Per Month. ( No Cylinder Rent Willbe Allowed Extra) [ Warranty Period: 30 Months After The Date Of Delivery ] ]