For additional circulation of air between drain and vent systems. See Diagram 1 1 . Riser.aA vertical water supply pipe one full story or more. Septic tank.a A receptacle between building house trap and a cesspool or leaching field. See Fig .
|Title||:||Plumbing code of New York City|
|Author||:||Samuel N. Lent, New York (N.Y.).|