Zurn P121-1WEIR 1-Slot Flo-Control Weir for Z121 Series Roof Drains, for Canadian Market Only.
The function of the Flo-Control weir is to limit and slow the drain rate through the roof drain. Provided with a single notch. It allows for large, flat roofs to drain slowly thereby not overwhelming the storm sewer systems.
Complete with integral clamping collar and weep-holes.
This product is for the CANADIAN market only, and is considered "high-profile".
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