Use the 2.25" Circulator with the 7.5" and 9" Matrix.
Place the Matrix Pad on the surface of your plant, the Matrix Unit on top of it, press down, fit the Circulator into the center holes, and connect your 1/4" OD tubing to the Circulator. Now let your plants enjoy the benefits of a top-feeding wicking system.
Item Number: 408409
Universal Product Code: 817593020403