tender for rubber kit for overhauling maintenance for a-9 auto brake valve comprising of 04 items for usedin electric locomovites as follows - 1) o ring, rdso drg. no. skdp- 3031 qty/set - 07 nos. 2) diaphragmrdso drg.no. skdp-3052, qty/set - 1 no. 3) seal valve rdso drg. no. skdp - 3044 qty/set - 1 no. 4)gasket rdso drg. no. skdp - 3056, qty/set- 1 no.