Supply of Heatless Twin Tower Air Dryer With Final Filter And Auto Drain Valve For Wag-7/Wap-4 Electric Locos Conforming To Rdso Specn. No Mp0 .01.00.06 Rev.06 March-2021 Str No Mp.Str.Bk.01.06.11 Rev.0 1 March 2021. Warranty Period: 30 Months After The Date Of Delivery