Equipment Pads are made from a high-density plastic and are a great way to ensure that your system is on a sturdy durable surface without having to use concrete or other heavy construction materials. The medium is 30” x 30” x 3” and fits SB-1 and SB-2 Solar Aeration Systems along with the AerMaster Pro line of electric aerators and all of the AerMaster Direct Drive Solar Aerators.