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 |
 | | 1 - Expose sewer line and mark sections to be removed. |
 | | 3 - PVC flap valve installed in tile sewer line. |
|  | | 2 - Remove the marked section of sewer line. |
 | | 4 - Flap valve with water flowing (normal operation). |
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