supply of semi-permanent coupler end-b , semi-permanent coupler end-b conforming to rdso specification no.61-b-36, rev -2, and t o schaku drg no. 40.587 a (0) consisting of 6 items [1] bearing bracket with support to schaku drg no.40 .588.07(2) [2] draw and buff gear to schaku drg no. 40.586.06(2) [3] intermediate tube to schaku drg n o. 40.586.01.01(2) [4] centering adjustment device .schaku drg no. 40.1000.10(2) [5] centering carrier t o schaku drg no.40.318.13(4) [6] air pipe coupling (complete). to schaku drg no. 40.587.04(3) note: to be procured from rdso approved sources only. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]