A mounting fixture for mounting a piece of telecommunications equipment within an underground vault is disclosed. The mounting fixture includes a frame structure configured to be mounted to an upper edge of an open end of a vault. The mounting fixture also includes a can structure for receiving the piece of telecommunications equipment. The can structure includes a closed end, an open end, and a sidewall extending between the closed end and the open end, the can structure being mounted to the frame structure. A cover including a top end and a skirt portion extending downwardly from the top end is slidably received within the can structure, the skirt portion sized to fit around the piece of telecommunications equipment and sized to fit within the sidewall of the can structure, the top end of the cover forming a water tight seal with the top end of the can structure.