The Current Culture H2O module lid was designed for ease of use and built to last. Structurally reinforced ribbing provides strength for huge plants and a snug, secure fit on the 8 and 13-gallon growth modules. Solid white, non-translucent ABS construction prevents light penetration. The quick access porthole allows for easy root viewing and includes an air inlet/finger holes for hoses to easily pass through. Made in California, Under Current Lids come standard with all Under Current systems.