Siphonic Overflow Roof Drain

Gain more usable building space and save on material costs with this siphonic overflow roof drain. Siphonic action keeps air out of pipes by inducing a negative pressure for quick, efficient drainage. Utilization of smaller diameter, non-sloping piping systems as compared to traditional gravity systems, will take up less space and require fewer downspouts. Drain is crafted with a Dura-Coated cast iron drain body and combination membrane flashing clamp/external overflow water dam. Includes a Dura-Coated cast iron air baffle and deck plate.