supply of twin tower heatless regenerative type air dryer.twin tower heatless regenerative type air dryer.,twin tower heatless regenerative type air dryer to rdso spec no: mp.0.01.00.06 [rev.06] [hhp-dmu] except clause no.7.3 and 7.7 as per rdso approved model no,orifice size and qap. the firm shall submit a copy of the approval letter of rdso mentioning the approved model no, orifice size and qap. 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]. [firm shall include the following suitably by embossing / engraving on the name plate: 1) model no., 2) orifice size, 3) coach application :hhp/demu [ warranty period: 36 months after the date of delivery ]