supply of semi permanent coupler , semi permanent coupler end-a conforming to rdso specification no.61-b-36,rev 68-1 wit h amendment 1 of oct-2016 and to schaku drg no. 40.586(0) consisting of 6 items: [1] intermediate tub e 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 schaku drg no. 40.586.06(2) [4] bearing bracket with support to schaku drg no.4 0.588.07(2) [5] adjustable cup sleeve to schaku drg no. 40.317.13(2) [6] centring carrier (sub assy) to s chaku drg no. 40.1000.10(2) note: to be procured from rdso approved sources only. [ warranty perio d: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted : max 8 lacs ] ]