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Installing a Valve - Installation of any of these backflow valves in an existing sewer line is dirty work but not technically challenging.
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Relative Cost of 4-inch Valves, not Including Installation | |
| 4" Valve | Price |
| Flap Valve (PVC) | $ 60 |
| Ball Valve (PVC) | $ 100 |
| Gate Valve (Brass) | $ 300 |
| Hydraulic gate or flap valve (brass or steel) | $ 1,500 |