TM 10-3930-669-34 15-3. STACK VALVE REPLACEMENT/REPAIR (CONT). e. Installation. (1) Install hose (31) on elbow (32). (2) Install hose (29) on 45° elbow (30). (3)    Install   stack   valve   (27)   on   bulkhead (28) with three washers (26) and nuts (25). (4)    Install tube (4) on elbow (24). (5)    Install   two   hoses   (20   and   21)   on adapters (22 and 23). (6)    Install hose (18) on fitting (19). (7)    Install hose (16) on fitting (17). 15-26