ULN550 : Master Plumber 3" Brass Flood Guard, Backflow Preventer

3" Brass Flood Guard, Back-flow Preventer

This flood guard operates like a check valve to seal off water back-up caused by overloaded sewers. Water flows normally through the drain until the sewer begins to back up. Then the flood guard float rises to seal off the drain opening until the water recedes.

Installation:
1. While holding the centre pin, place the back-flow preventer into a 4" floor drain or pipe with adjusting holes facing up.
2. Tighten adjusting screws to lock the back-flow preventer in position.