A pressure vessel configured to store pressurized fluid comprising: a plurality of lobes (25, 30, 35), each lobe including at least one vertically oriented interior wall, the plurality of lobes (25, 30, 35) being positioned in a side by side configuration such that a first interior wall of a first lobe is positioned adjacent a second interior wall of a second, adjacent lobe, the first interior wall and the second interior wall are configured to contact one another at a first point of tangency, and a first tangent contacts the first lobe at the first point of tangency and a second tangent contacts the second lobe at the first point of tangency such that the first tangent and the second tangent are separated by about 120 degrees; further comprising an end cap mounted to a first end and a second, opposite end of each of the plurality of lobes (25, 30, 35); characterized in that an external manifold is mounted to the end caps and configured to fluidly couple to each of the plurality of lobes (25, 30, 35); an external boss is formed on the exterior of each end cap, adjacent each lobe (25, 30, 35) of the pressure vessel, each external boss including a first through hole arranged generally parallel to a horizontal plane and a second through hole extending perpendicularly from the first through hole into the interior of the pressure vessel; a connector is fluidly coupled to the first through hole and to the interior of the pressure vessel and being mounted to both sides of each boss; a piece of tubing extends from a connector of a first external boss to a connector of a second external boss; and the position of the external boss on an end cap, relative to each lobe (25, 30, 35) is alternating such that the tubing extending between adjacent connectors is arranged in a Z-shape. a plurality of lobes (25, 30, 35), each lobe including at least one vertically oriented interior wall, the plurality of lobes (25, 30, 35) being positioned in a side by side configuration such that a first interior wall of a first lobe is positioned adjacent a second interior wall of a second, adjacent lobe, the first interior wall and the second interior wall are configured to contact one another at a first point of tangency, and a first tangent contacts the first lobe at the first point of tangency and a second tangent contacts the second lobe at the first point of tangency such that the first tangent and the second tangent are separated by about 120 degrees; further comprising an end cap mounted to a first end and a second, opposite end of each of the plurality of lobes (25, 30, 35); characterized in that an external manifold is mounted to the end caps and configured to fluidly couple to each of the plurality of lobes (25, 30, 35); an external boss is formed on the exterior of each end cap, adjacent each lobe (25, 30, 35) of the pressure vessel, each external boss including a first through hole arranged generally parallel to a horizontal plane and a second through hole extending perpendicularly from the first through hole into the interior of the pressure vessel; a connector is fluidly coupled to the first through hole and to the interior of the pressure vessel and being mounted to both sides of each boss; a piece of tubing extends from a connector of a first external boss to a connector of a second external boss; and the position of the external boss on an end cap, relative to each lobe (25, 30, 35) is alternating such that the tubing extending between adjacent connectors is arranged in a Z-shape.