TM 10-3930-669-20 17-10.  MAIN HYDRAULIC SYSTEM HOSE AND TUBE REPLACEMENT (CONT). g.  Stack Valve Low Pressure Hose and Tube Replacement. (1) Removal. (a) Remove hose (41) from elbow (42) and valve (43). (b) Remove tube (44) from elbow (45) and 90° adapter tube (46). (c) Remove hose (47) from adapter (48) and elbow (49). (2) Installation. (a) Install hose (47) on adapter (48) and elbow (49). (b) Install tube (44) on elbow (45) and 90° adapter tube (46). (c) Install hose (41) on valve (43) and elbow (42). 17-58