Sioux Chief 239 Anti-Siphon Auto Vent, 1-1/2" MPT ABS

• For secondary venting only. Each drainage system must have a main vent stack
• To be installed in a readily accessible location with free flow of air, never in a sealed wall cavity
• Sealing disc of auto vent must be located at least 6" above the top of the trap arm
• Two fixtures may be drained by a common 1½" drain pipe. Three or more fixtures will require a 2" drain pipe
• ABS material