triton II sand filter

The center piece is called the diffuser assembly. You can just push it horizontally to rotate it out of the way. Rotate it back up when you are finished replacing the sand.
Pentair said:
Pivot the diffuser out of the center of the tank on the TR40, 50, 60, TR60 ClearPro, 100 & 140 by rotating the diffuser assembly counter clockwise. (NOTE: The multi-diffuser assembly should not be moved on models TR100C, TR100C-3 and TR140C, TR140C-3.

After installing the filter media as described below, check to make sure the tops on the diffusers are parallel to the top of the sand bed.) Fill the tank about half full of water. Pour pea gravel first (if used) and then the sand into the top of the filter at a slow rate so that the impact of the filter media does not damage the laterals.
 
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