TM 10-3930-669-20 (2) Installation. (a)   Install two preformed packings (13) and hose (12) on primary cylinder manifold adapter (14) and secondary cylinder manifold (4). (b)   Install preformed packing (10) and hose (9) on adapter (8) and manifold (11). (c)   Install preformed packing (6) and tube (5) on secondary cylinder regulator valve (7). (d)   Install preformed packing (6) and adapter (8) on tube (5). (e)   Install two preformed packings (2) and hose (1) in secondary cylinder manifolds (3 and 4). 17-37