supply of over hauling kit for duplex check valve of m/s. knorr-bremse .for air spring suspension system of emu coaches consisting of 4 items conforming to rdso spec.no. str- ck 407 rev-02. (1) sealing ring- 453890=02 nos/sets. (2)o ring-a 27763/26=02 nos/sets. (3) loking ring-466031=02 nos/sets (4) valve head-a48128=02 nos/sets. , over hauling kit for duplex check valve of m/s. knorr-bremse .for air sprin g suspension system of emu coaches consisting of 4 items conforming to rdso spec.no. str- ck 407 rev-02. (1) sealing ring- 453890=02 nos/sets. (2)o ring-a 27763/26=02 nos/sets . (3) loking ring-466031=02 nos/sets (4) valve head-a48128=02 nos/sets. [ warranty period : 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]