OVER HAULING KIT FOR DUPLEX CHECK VALVE OF M/ S. KNORR- BREMSE INDIA PVT. LTD. MAKE USED IN AIR SPRING SUSPENSION SYSTEM OF EMU COACHES CONSISTING OF 4 ITEMS TO DRG./ SPEC. NO AS: 1 ) SEALING RING- A38X44 DIN 7603 = 02 NOS/ SETS. 2 ) ' O ' RING- 4A75374 = 02 NOS/ SETS. 3 ) TOOTHED WASHER- 4A63625 = 02 NOS/ SETS. 4 ) VALVE HEAD = A48128 = 02 NOS/ SETS CONFIRMING TO RDSO ' S SPEC. NO. STR- K407 ( REV- 02 ). as per Drg. No. as per description specn: SPEC. NO. STR- K407 ( REV- 02 )