Tank for a modular hydraulic power unit for the supply of a pressurized fluid; said tank extending primarily along a vertical direction; said tank being provided with a first opening which is positioned at an upper portion of said tank and through which a fluid can be introduced into said tank; said tank further comprising a conduit having a first and a second end portion (102a, 102b), wherein said first end portion is attached to said first opening and wherein said second end portion is positioned at a central portion of said tank so as to convey said fluid coming from said first opening to a central portion of said tank; wherein said second end portion of said conduit is configured so as to release the fluid coming from said first opening along a direction substantially perpendicular to said vertical direction of said tank; wherein said tank comprises at least one inclined surfaces, which faces said second end portion of said conduit and which is inclined with respect to said vertical direction of said tank so as to deflect the flow of fluid coming from said second end portion of said conduit toward an upper portion of said tank, wherein a lower portion of said tank, which is positioned below, preferably directly below, said inclined surface is substantially a lower prism, wherein said lower prism is elongated along said vertical direction, wherein at least one side of said lower prism is provided with a second opening, wherein connecting means are provided at said second opening so as to protrude externally to said tank, wherein said connecting means are configured to enable the fluid connection of the internal volume of said tank with another tank having analogous characteristics. said tank extending primarily along a vertical direction; said tank being provided with a first opening which is positioned at an upper portion of said tank and through which a fluid can be introduced into said tank; said tank further comprising a conduit having a first and a second end portion (102a, 102b), wherein said first end portion is attached to said first opening and wherein said second end portion is positioned at a central portion of said tank so as to convey said fluid coming from said first opening to a central portion of said tank; wherein said second end portion of said conduit is configured so as to release the fluid coming from said first opening along a direction substantially perpendicular to said vertical direction of said tank; wherein said tank comprises at least one inclined surfaces, which faces said second end portion of said conduit and which is inclined with respect to said vertical direction of said tank so as to deflect the flow of fluid coming from said second end portion of said conduit toward an upper portion of said tank, wherein a lower portion of said tank, which is positioned below, preferably directly below, said inclined surface is substantially a lower prism, wherein said lower prism is elongated along said vertical direction, wherein at least one side of said lower prism is provided with a second opening, wherein connecting means are provided at said second opening so as to protrude externally to said tank, wherein said connecting means are configured to enable the fluid connection of the internal volume of said tank with another tank having analogous characteristics.