The CCH2O module lid was designed for ease of use and built to last. Structurally reinforced ribbing provides strength for big trees and a secure fit on the 8 and 13 gallon growth modules. Solid white, non-translucent ABS construction prevents light penetration. The quick access port hole allows for easy root viewing and includes an air inlet/finger holes for hoses to easily pass through. Made in California. Comes standard with all Under Current? systems. Mix and match these lids with multiple plant spacing options for your desired set up. Some items are drop ship only.