supply of semi-permanent coupler end b. drawing no. : m / s escorts drg. no. sk-751 [ consisting of 05 items : ( i ) intermediate tube to m / s escorts drg. no. sk-754, ( ii ) air pipe coupling ( complete ) to m / s escorts drg. no. sk-198, ( iii ) draw and buff gear to m / s escorts drg. no. sk-752, ( iv ) centering carrier ( sub-assy. ) to m / s escorts drg. no. sk-825 and ( v ) centering device ( sub-assy. ) to m / s escorts drg. no. sk-756 ] or m / s wsf make or m / s sanrok enterprises make to their equivalent drawings. material and specification : rdso spec. no. 61-b-36, rev. 68-1 with amendment 1 of 2016. [ warranty period: 30 months after the date of delivery ]