A pressurized-gas storage boss assembly for directing migrated gas through a migration passage, the pressurized-gas storage boss assembly comprising: a liner defining a gas storage chamber and having a polar end portion with a substantially planar surface, having an access opening on the planar surface which is in fluid communication with the gas storage chamber, the liner further including a raised circular neck ring extending from the planar surface and surrounding the access opening, the raised circular neck ring having a smooth outer ring wall, a top wall and an inner annular wall, with a set of helical neck threads provided on the inner annular wall; a boss having a longitudinally extending body that has a top surface, a bottom end of the body which is extended laterally forming a flange having a planar bottom surface with a fluid connection to serve as a fluid passageway through the boss to the gas storage chamber, the boss further including a liner mounting connection on the planar bottom surface, the liner mounting connection has a groove adapted to be threadably engaged with the raised circular neck ring including a top, an outer annular wall which is substantially smooth, and an internal annular wall which is helically threaded to engage the neck threads; a support layer forming an outer shell around the liner and at least a portion of the boss, wherein a shell/liner interface is disposed between the support layer and the liner and if the gas in the storage chamber migrates through the liner, the migrated gas flows along the shell/liner interface; a boss/liner interface defined by a first interface disposed between the planer bottom surface and the polar end, a second interface disposed between the outer annual wall and the smooth outer ring wall, and a third interface disposed between the top and the top wall, wherein the boss/liner interface is in fluid connection with the shell/liner interface and the boss/liner interface is configured to convey the migrated gas to flow therethrough; wherein the boss is configured to be screwed onto the liner, via the raised circular neck ring such that the helical neck threads are engaged with the corresponding helical threads of the internal annular wall; wherein the fluid connection of the boss further comprises an annular channel wall forming a passage; wherein the boss further comprises a migration passage configured to receive the flow of migrated gas from the boss/liner interface and convey the migrated gas into the gas storage chamber via the passage, and wherein the migration passage is in fluid communication with the boss/liner interface via a pathway for directing the migrated gas, the pathway comprising the non-threaded interface between the outer annular wall and smooth outer ring wall, such that the migrated gas is permitted to flow from the boss/liner interface into and through the migration passage and into the passage. a liner defining a gas storage chamber and having a polar end portion with a substantially planar surface, having an access opening on the planar surface which is in fluid communication with the gas storage chamber, the liner further including a raised circular neck ring extending from the planar surface and surrounding the access opening, the raised circular neck ring having a smooth outer ring wall, a top wall and an inner annular wall, with a set of helical neck threads provided on the inner annular wall; a boss having a longitudinally extending body that has a top surface, a bottom end of the body which is extended laterally forming a flange having a planar bottom surface with a fluid connection to serve as a fluid passageway through the boss to the gas storage chamber, the boss further including a liner mounting connection on the planar bottom surface, the liner mounting connection has a groove adapted to be threadably engaged with the raised circular neck ring including a top, an outer annular wall which is substantially smooth, and an internal annular wall which is helically threaded to engage the neck threads; a support layer forming an outer shell around the liner and at least a portion of the boss, wherein a shell/liner interface is disposed between the support layer and the liner and if the gas in the storage chamber migrates through the liner, the migrated gas flows along the shell/liner interface; a boss/liner interface defined by a first interface disposed between the planer bottom surface and the polar end, a second interface disposed between the outer annual wall and the smooth outer ring wall, and a third interface disposed between the top and the top wall, wherein the boss/liner interface is in fluid connection with the shell/liner interface and the boss/liner interface is configured to convey the migrated gas to flow therethrough; wherein the boss is configured to be screwed onto the liner, via the raised circular neck ring such that the helical neck threads are engaged with the corresponding helical threads of the internal annular wall; wherein the fluid connection of the boss further comprises an annular channel wall forming a passage; wherein the boss further comprises a migration passage configured to receive the flow of migrated gas from the boss/liner interface and convey the migrated gas into the gas storage chamber via the passage, and wherein the migration passage is in fluid communication with the boss/liner interface via a pathway for directing the migrated gas, the pathway comprising the non-threaded interface between the outer annular wall and smooth outer ring wall, such that the migrated gas is permitted to flow from the boss/liner interface into and through the migration passage and into the passage.