Drainage cap and cold storage

A drainage cap comprising:

• a body part configured to be inserted to a drainage outlet and formed in a cylindrical shape extending in a first direction and having a hollow center portion, the hollow center portion having a first opening at a first end of the hollow center portion and a second opening at a second end of the hollow center portion;
• and
• a flange part provided at the first end of the hollow center portion to radially extend from the first opening so as to fully surround the first opening without closing the first opening, and including a plurality of notches and a plurality of opposing parts, each provide between adjacent notches of the plurality of notches at a peripheral portion of the flange part, the plurality of opposing parts being configured to face a peripheral portion of the drainage outlet, the plurality of notches and the plurality of opposing parts surrounding the first opening when viewed from the first direction, and a center of the flange part passing through the first opening,
• an outer diameter of the body part is smaller than an inner diameter of the drainage outlet so that the body part is formed to have a gap between the body part and the drainage outlet and so that condensation water can be discharged from the gap between the body part and the drainage outlet,
• an outer diameter the plurality of opposing parts of the flange part is larger than the outer diameter of the hollow center portion and the outer diameter of the plurality of opposing parts is larger than the inner diameter of the drainage outlet, and
• each of the plurality of notches is formed to be notched to inside of the drainage outlet in a radial direction.