Sioux Chief 696 series TurboVent air admittance valves with access box shall be installed as vent terminal for secondary venting within the plumbing system. Valve shall connect to DWV system via Sch 40/STD adapter which complies with ASTM D2665 (PVC) or D2661 (ABS), and be made accessible after finish wall is installed. Valve shall incorporate an actuating device which spins upon activation to keep the elastomeric sealing surface clean and free of debris. During drainage, actuating device shall raise a designed distance under negative line pressure to allow optimal air flow into the DWV system. Valve shall provide a positive seal at 0 psi and under any positive line pressure to prevent sewer gasses from entering the living space. Valve shall be made in USA, comply with IPC model code and be Certified to ASSE 1050 and 1051 standards.