Sioux Chief 869-2A – 2 ABS Backwater Valve Fashion
$11.702 ABS Backwater Valve Threaded access seals hand-tight and allows for easy maintenance and inspection 6 backwater valve extensions – use 10 Sch. 40 pipe (not included) For GRAVITY FLOW applications only Do not install vertically UPC IAPMO listed  IEZJ411389