supply of twin tower heatless regenerative type air dryer to rdso / specn.no.mp.0.01.00.06 ( rev.06 ) march 2021 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 bsp as per rdso drg no-sk dp 3566 ( annexure-4 of the governing specification ) firm shall include the following , suitably by embossing / engraving on the name plate 1 ) model no- 2 ) orifice size 3 ) coach applicatio:hhpdmu. [ warranty period: 30 months after the date of delivery ] furnishing tamil nadu 52.00 set