supply of semi permanent coupler end b conforming to rdso specification no.61 - b - 36, rev. 68-1 with amendment no. 1 of october 2016 and to m/s.escorts make drawing. no. sk-751 consisting of 5 items(1) intermediate tube.to escorts drg.no.sk-754 (2) air pi pe coupling (complete).to escorts drg.no.sk-198 (3) draw and buff gear to escorts drg.no.sk.752 (4) centering carrier (sub assy.) to escorts drg.no.sk-825 (5) centering device (sub assyembly).to escorts drg.no.sk-756 or m/s.wsf make or m/s.sanrok ente rprises make to their equivalent drawing for emu/memu application. [ warranty period: 30 months after the date of delivery ]