supply of twin tower air dryer , twin tower heatless regenerative type air dryer (with air filter) to rdso s pec no. mp-0.01.00.06 [rev. 06] march 2021 [hhp-dmu] except clause no. 7.3 and 7.7 and as per str no. mp. str. bk.01.06.11 (rev.-02) as per rdso approved model no., orifice size, and qap. note: 1. the flange connection of inlet and outlet pipes should be 1-1/4 inch bsp as per rdso drawing no. 3566 [ann-iv of governing specification. 2. the firm shall submit a copy of the approval letter of rdso mentioning the approved model no, orifice size and qap. [ warranty period: 36 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]