Discharge system for septic tank

A discharge system for a septic tank having a substantially horizontal discharge port comprising a conduit including a coupling lying substantially on the axis of and connected to said discharge port;

• a tube coupled to the conduit coupling and having a free open outlet end;
• tube pivot means whereby said tube pivots with relation to said conduit coupling so that the liquid in the tank flows into the tube to maintain the liquid in the tube at the level of the liquid in said tank;
• means normally maintaining the outlet end of the tube in a raised position, yet allowing the tube to pivot downwardly when a predetermined head in the tank is reached whereby a rapid discharge is effected through said open end, the tube raising through action of said last named means when the head is insufficient to keep the tube in a down position, said means comprising an arm, a counter weight on said arm, said arm attached to the tube at such an angle to the tube axis that the torque tending to elevate the tube about said pivot means when the tube is in the elevated position is greater than when it is in the discharge position, and wherein the force is applied at a shorter moment arm when the tube is in the down position to permit delayed return to an elevated position and allow maximum discharge of the retained liquid wherein said weight is disposed on one side of the vertical axis passing through and perpendicular to the axis of the pivot means in both said elevated and discharge positions.