supply of overhauling kit for driver s backup valveoverhauling kit for driver s backup valve,overhauling kit for drivers backup valve (ptdc) (787609) of knorr- bremse make ccb s ystem for wap-7/wag-9 locomotives. one set consisting of 27 items. item detail as per kbi annexure attached. firms offer: overhauling kit for drivers back-up valve (787609) of electric ccb system. one set consisting of 27 items. item detail as per kbi annexure attached. specn: kbi kit no. xki/kit/02518 [ 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 ] ]