The CCH2O Split 12 Air Manifold & CCH2O Split 24 Air Manifold work with linear air pumps to distribute oxygen to air diffusers (air stones and Aqua-Pore diffuser disc). The chrome distribution manifold comes standard on all models and allows for each growth module to be individually adjusted with an on/off valve. Suitable for all gardening applications. Comes with Includes 3/4 in hose and 3/4 in clip clamps. Comes standard with all Under Current® systems. Manufactured in California.