supply of twin tower heatless regenerativetwin tower heatless regenerative,twin tower heatless regenerative type air dryer to rdso spec no. mp.0.01.0 0.06 [rev.06] [hhp-dmu] except clause no. 7.3 and 7.7 as per rdso approved model no, orif ice 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 specific ation] [firm shall include the following suitably by embossing / engraving on the name plate: 1) model no. 2) orifice size, 3) coach application: hhp /demu/detc. (blw item id: 2201 247) [ warranty period: 30 months after the date of delivery ] ]