Hydrofarm  AAPADIV12 Active Aqua 12-Outlet Copper Air Divider
This multi-outlet divider can be individually opened or shut, for total aeration control. Recommended tubing sizes input 3/8-inch internal diameter and output 0.17-inch internal diameter. This product weighs 0.6-pound. Measures 9-1/2-inch length by 1-1/2-inch width by 4/5-inch height.