All module lids are made of durable ABS plastic and are interchangeable on both the 8 gal. and 13 gal. growth module. Each lid features an air inlet hole and finger hole for easy viewing/moving. The new series of CCH2O Lids were designed and made exclusively for Current Culture H2O™ and the Under Current™ systems. Incorporating unique features like clip over fit, extra heavy duty reinforced ribbing, air hose inlets and an integrated port-hole for quick root and water level checks. CCH2OLID8: Accommodates CCH2O 8” Net Pot or 8” Heavy Duty Net Pot Made in CA.