Water Barricade Fill Hole Cap is a replacement cap for water barriers used as replacement drain plug with O-rings. It is used to replace lost or damaged plugs for the plasticade water barricade system. Its working design and its structure are made from polyethylene, which guarantees resistance to weathering and cracking. This plug can be threaded which facilitates the loading and unloading of water in any water barricade system. In addition, this water barrier cap is manufactured to facilitate its fitting and handling and ensures speed in its installation and replacement process, if necessary.