supply of twin tower heatless regenerative , supply of twin tower heatless regenerative type air dryer to rdso/specn.n o.mp.0.01.00.06 (rev.06) march 2021 except clause no.7.3 and 7.7 as per rdso approved mo del 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 bsp as per rdso drg no-sk dp 3566(annexure-4 of the go verning specification)firm shall include the following ,suitably by embossing /engravin g on the name plate 1) model no- 2)orifice size 3)coach application:hhp- dmu. [ warranty period: 36 months after the date of delivery ] ]