Hybrid pressure vessel having a liner made of plastic with an inside and an outside , having a maximum outer diameter (DL), and a metallic boss having an outer diameter (DB), wherein the metallic boss is adapted to receive a valve , wherein the hybrid pressure vessel has a storage volume (SV) on the inside, wherein the liner is pipe-shaped, wherein the outer diameter (DB) of the boss is at least as large as the maximum outer diameter (DL) of the liner , wherein the liner is made of a plastic material at least partially plastically deformable under pressure, the hybrid pressure vessel has further at least one outer layer applied on the liner to the reinforcement thereof and a boss with a squeezing ring and counter piece for receiving the valve and for sealing the storage volume with respect to the liner , wherein the liner comprises a cylindrical connecting area with an outside and an inside for connecting the boss , wherein the squeezing ring is positioned on one side of the connecting area of the liner and the counter piece for generating a sealing pressure (AD) between squeezing ring , connecting area of the liner and counter piece is positioned on a different side of the connecting area of the liner , wherein the counter piece has on its side facing the connecting area of the liner a suitably formed groove with a first edge facing the storage volume (SV) and a second edge in the opposite direction for receiving a sealing ring which seals under the sealing pressure (AD), wherein the groove and the sealing ring are dimensioned and the liner material is provided to form first and second sealing beads protruding at least in both gaps (L1, L2) between sealing ring and first and second edge under the sealing pressure (AD) due to its plastic deformability. wherein the liner is pipe-shaped, wherein the outer diameter (DB) of the boss is at least as large as the maximum outer diameter (DL) of the liner , wherein the liner is made of a plastic material at least partially plastically deformable under pressure, the hybrid pressure vessel has further at least one outer layer applied on the liner to the reinforcement thereof and a boss with a squeezing ring and counter piece for receiving the valve and for sealing the storage volume with respect to the liner , wherein the liner comprises a cylindrical connecting area with an outside and an inside for connecting the boss , wherein the squeezing ring is positioned on one side of the connecting area of the liner and the counter piece for generating a sealing pressure (AD) between squeezing ring , connecting area of the liner and counter piece is positioned on a different side of the connecting area of the liner , wherein the counter piece has on its side facing the connecting area of the liner a suitably formed groove with a first edge facing the storage volume (SV) and a second edge in the opposite direction for receiving a sealing ring which seals under the sealing pressure (AD), wherein the groove and the sealing ring are dimensioned and the liner material is provided to form first and second sealing beads protruding at least in both gaps (L1, L2) between sealing ring and first and second edge under the sealing pressure (AD) due to its plastic deformability. <EOS>