Various accessories and attachment parts mounted on tank bodies. Includes liquid level gauge mounting seats, thermometer seats, pressure gauge seats, safety valve seats, manholes, handholes, drain valves, air vent valves, agitator mounting flanges, piping connection nozzles, sight glasses, level switch mounting seats, cleaning ports, inspection ports, etc. Available in different materials including stainless steel, carbon steel, and resin. Covers standard products compliant with JIS and JPI standards to custom-made products. Designed for functional improvement, maintenance enhancement, and safety assurance of tank bodies, intended for use in chemical plants, food factories, and pharmaceutical facilities. Specialized accessories clearly distinguished from tank bodies, piping components, and measuring instrument bodies.