Septic tank distribution box system

A system for periodically discharging a predetermined amount of septic effluent into a leaching field comprising a distribution box having an inlet opining and a plurality of outlet openings formed therein, said outlet openings being located at a level in said box below the level at which said inlet opening is located, an open-topped tray pivotally mounted in said distribution box at a level located between levels of said inlet and outlet openings in said box, said tray having an effective capacity approximately equal to said predetermined amount, a counterweight secured to said tray on one side of the pivotal mounting thereof and a first stop means for maintaining said tray in a horizontal position, against the action of the counterweight, when said tray is empty, said tray being located to receive effluent from said inlet opening and said counterweight being dimensioned to be overcome by effluent is in the tray when said predetermined amount of effluent is in the tray where by the tray pivots against the influence of the counter weight away from said first stop to empty the tray and discharge said predetermined amount of effluent to said outlet pivotal movement of the tray away from the first stop to a predetermined effluent emptying position, each of said outlet openings being located at approximately the same level so that effluent periodically discharged from said tray will enter said outlet openings substantially simultaneously.