supply of isolating cock olp type with vent hole for brake cylinder only (ball type) for bogie mounted ab coaches to rdso drg no. 98013 alt-nil. appendix-i of 02-abr-02 amdt .no.4 of sept 2016.isolating cock olp type with vent hole for brake cylinder only (ball type) for bogie mounted ab coaches to rdso drg no. 98013 alt-nil. appendix-i of 02-abr-02 amdt .no.4 of sept 2016.,isolating cock olp type with vent hole for brake cylinder only (ball type) for bogie mounte d ab coaches to rdso drg no. 98013 alt-nil. appendix-i of 02-abr-02 amdt .no.4 of sept 2016. [ warra nty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted : max 8 lacs ] ]