Hydrofarm  AAPADIV8 Active Aqua 8-Outlet Copper Air Divider
This multi-outlet divider can be individually opened or shut, for total aeration control. Recommended tubing sizes input 5/16-inch internal diameter and output 0.17-inch internal diameter. This product weighs 0.4-pound. Measures 6-2/7-inch length by 2-1/5-inch width by 1/5-inch height.