supply of over hauling kitover hauling kit,over hauling kit for duplex check valve of m/s knorr-bremse india pvt. ltd make used in air spring suspension system of emu/lhb/demu coaches consisting of 4 item s to knorr-bremse drg/part no. as 1) sealing ring-453890 =02 nos/sets. 2) o-ring- a27763/ 26= 02 nos/sets 3) toothed washer-466031= 02 nos/sets. 4) valve head-a48128= 02 nos/se ts. confirming to rdsos spec.no. str-c-k-407 (rev-04) march 2023 or latest. [ warranty peri od: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]