A Tub Flange is a square device that mounts to a tub so a pipe can be pushed through the tub without leaking. The Tub Flange has a rubber gasket that makes a seal around the tube. The tub can be connect to other tubs to provide a series of settling “ponds” allowing for a self contained system. A Tee is used to help keep organics, from entering into the next tub as the sub-surface water is only allow to enter. A Tub Flange System uses ported water and creates little or no surface disturbance in sensitive areas. We recommend using three tub system (see photo) for maximum water clarity and extended processing time.