supply of semi permanent coupler end-bsemi permanent coupler end-b,semi permanent coupler end-b conforming to rdso specification no.61-b-36,rev 68-1 with amen dment 1 of oct-2016 and to schaku drg no. 40.587(0) consisting of 6 items [1] intermediate tube to schaku drg no. 40.586.01.01(2) [2] air pipe coupling (complete). to schaku drg no. 40.587.04(3) [3] draw and buff gear to s chaku drg no. 40.586.06(2) [4] bearing bracket with support to schaku drg no.40.588.07(2) [5] centering devic e (sub assy).schaku drg no. 40.318.13(4) [6] centring carrier (sub assy) to schaku drg no. 40.1000.10(2) not e: to be procured from rdso approved sources only. [ warranty period: 30 months after the date of delivery ] => limited