Isolating Cock with vent for Bogie Mounted Air Brake Coaches. Drawing No.: RDSO ' s Drawing No SKETCH- 98013, Alt. Nil, Item Nos. 1 to 12 in assembled condition. Material and Specification: As per drawing and RDSO ' s Specification No. 02- ABR- 02, Amend. 4 of Sept. 2016, Appendix- ' I '.