Fully compatible with the Flo-n-Gro system, the Flo-n-Gro 6 cell expansion kit allows you to increase your yield without a huge investment. The kit comes with six (6) 4 gallon grow sites and six (6) 3 gallon 360? "snap in" mesh aeration inserts. These mesh inserts promote lateral root growth and better aeration for the root zone. The "snap in" feature keeps your plants from "floating" in the system. The kit includes 3/4" tubing and all the required fittings to hook up the system.