Internal supporting part structure for plastic tank

An internal support part structure for a plastic tank, comprising:

• a support rod and end surface components;
• wherein
• the end surface components are disposed at two ends of the support rod and share a central axis with the support rod,
• the support rod is made of a first material,
• an outer surface of each end surface component of the end surface components is covered by a second material,
• an outer edge of the each end surface component has a regular shape or an irregular shape, and
• a ratio of a cross-sectional diameter at a position of the each end surface component to a cross-sectional diameter at a position of the support rod is less than 1.8 and greater than 1, wherein the cross-sectional diameters are perpendicular to the central axis,
• wherein the outer edge of the each end surface component comprises a plurality of indentations that are V-shaped, W-shaped, semicircular, arc-shaped, zigzag, or multi-sided when viewed in a cross-sectional plane that is perpendicular to the central axis, wherein the indentations are indented toward the central axis in the plane wherein at least one of the indentations is filled with said second material.