supply of overhauling kit for duplex check valve of m/s knorr-bremse make used in airspring suspension system of emu coaches, consisting of 4 (four) nos. items inset. , overhauling kit for duplex check valve of m/s knorr-bremse make used in air spring sus pension system of emu coaches, consisting of 4 (four) nos. items in set. (1) sealing ring, kbi part no. 453890, qty-02nos/sets (2) o-ring, kbi part no. a27763/26, qty- 02nos/set (3) toothed washer, kbi p art no. 466031, qty- 02 nos/set (4) valve head, kbi part no. a48128 qty-02 nos/set. [ warranty peri od: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]