Gasket for Air Brake Hose Coupling for Brake Pipe. Drawing No.: RDSO, s Drg. No. Sk. 73547, Alt. 14, Item 4. Material and Specification: AAR: M- 602/ 63 and Conforming to RDSO ' s Spec. No. 02- ABR- 02 with Amend. No. 4 of Sept. 2016, and appendix- F.