110mm Black soil pipe air admittance valve solvent weld
917.3.3 [Air Admittance Valve] vs. Stack. Stack-type air admittance valves shall not serve as the vent terminal for vent stacks or stack vents . 917.4 [Air Admittance Valve] Location. Individual and branch-type air admittance valves shall be located a minimum of 4 inches (102 mm) above the horizontal branch drain or fixture drain being vented.
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