supply of overhauling kit for duplex check valve of m/s knorr-bremse make used in air spring suspension system of emu coaches, consisting of 4 (four) nos. items in set.overhauling kit for duplex check valve of m/s knorr-bremse make used in air spring suspension system of emu coaches, consisting of 4 (four) nos. items in set.,overhauling kit for duplex check valve of m/s knorr-bremse make used in air spring su spension 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, kb i part no. 466031, qty- 02 nos/set (4) valve head, kbi part no. a48128 qty-02 nos/set. [ warranty p eriod: 30 months after the date of delivery ] ] workshop carriage stores/kgp, west bengal 700.00 set