- Operates like a check valve to seal off water back-up caused by overloaded sewers
- Water flows normally through the drain until sewer begins to backs up
Master Plumber Backflow Preventer – Brass – 4″
$26.00 Original price was: $26.00.$18.20Current price is: $18.20.
- 7 days return and exchange
- 100% environmentally friendly material
- Service that stands out, online and always timely.
- Unbeatable Quality, Unbeatable Value

Protect your home from backwater flooding with this Master Plumber antiflooding device for 4-inch diameter drains. The brass flood guard allows water to flow normally through the drain until the sewer backs up. It then arises to seal off the backwater until the water recedes. 1 unit per package.
| Warranty | 1-year limited |
|---|---|
| Type | Backflow preventer |
| Complies with Federal Lead Guidelines | Yes |
| Inlet Diameter | 0 |
| Inlet Size in Inches | 4-in |
| Inlet Thread Type | N/A |
| Material | Brass |
| Maximum Pressure | 0 PSI |
| Outlet Diameter | 0 |
| Outlet Thread Type | N/A |
| Series Name | N/A |
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