receiver inner leg 314 for receiving packing material 318 fig6 shows a flexible metal hose section 402 as shown the hose 402 includes an outer band 404 with an s shaped cross sectional profile configuration whereby inwardly and outwardly open channels 406 408 are formed the inwardly open channel 406 receives packing material 410 and the upstream leg 412 of another section of the outer band 404 an inner band 406 has an l shaped cross sectional profile with a base leg 410 and a return leg 412 projecting outwardly therefrom the return leg 412 engages a respective outer band upstream leg 412 within a respective inwardly open channel 406 the inner band 406 provides a smoother bore 420 and also increases the sealing aspect of the hose 402 by providing upstream and downstream contact points 422 424 respectively vii fifth modified embodiment self sealing flexible metal hose 502 new fig7 and 8 show a self sealing flexible metal hose 502 comprising a fifth modified embodiment of the present invention the flexible metal hose 502 comprises a band 504 which is spiral wound for interlocking on suitable spiral hose winding equipment the profile of the band 504 includes leading and trailing edges.