The Top Mount Pull-Up pole is sometimes called a Thru-the Deck Top Raise pole. It is excelent for mounting above the pump or non-weatherproof equipment compartments. The pole is raised from the top by pulling up from above the mounting flange. When the pole is in the down position the inner (extension) tube will be inside the compartment. **Note: The mounting flange is not weatherproof and may seep water, for a weatherproof flange on a top mount telescopic pole see the 512 Thru-the-Roof series poles.