supply of overhauling kit for duplex check valve of m / s. faiveley make to pt.no.790039105 for air spring suspension system of emu coaches consisting of 4 ( four ) nos. items in set and conforming to rdsos specn. no.c-k-407 rev. 03, amendment - 1 of september 2018 items are as ( i ) valve seat ( sub assly ) to m / s. ftrtil part no.039101000. qty - 02nos / set, ( ii ) compression spring to m / s. ftrtil part no.039802000 qty- 02nos / set, ( iii ) seal ( 26x33x1 ) to m / s. ftrtil part no.039703000 qty - 02 nos / set, ( iv ) joint ( 19x33x1 ) to m / s. ftrtil pt. no.039704000 qty - 01 no. / set. specn / drg.no.: rdsos specn. no.c-k- 407 rev. 03, amendment - 1 of september 2018. [ warranty period: 30 months after the date of delivery ]