Which size should I choose?
Follow these steps to measure the diameter of your water service line:
- Take a piece of string approximately 15 cm (6 in.) long.
- Locate your main water inlet (usually located in the basement or in your garage).
- Clear the pipe, if necessary, by removing any insulation material.
- Wrap the string around the pipe to measure its circumference.
a. Note: It is best to measure on a straight section of pipe, away from fittings (elbows or valves), as the diameter may appear larger there. - Use the following table to determine your pipe size based on the length of the string:
| Pipe type | String length | Pipe diameter |
|
Copper
|
70 mm (2.75 in.) | 3/4 in. |
| 90 mm (3.53 in.) | 1 in. | |
|
Steel or PVC
|
83 mm (3.25 in.) | 3/4 in. |
| 102 mm (4.00 in.) | 1 in. | |
|
Flexible polyethylene (PEX)
|
75-85mm (2.96-3.33 in.) | 3/4 in. |
| 95-108mm (3.74-4.24 in.) | 1 in. |