## Pipe Diameter for Kitchen Sinks
The diameter of the pipe used for a kitchen sink depends on a few factors, including the size and type of sink, the number of fixtures connected to the sink, and the local plumbing codes.
### Standard Pipe Sizes
The most common pipe diameters used for kitchen sinks are 1-1/2 inches and 2 inches.
* **1-1/2 inch pipe:** This size is typically used for single-bowl sinks and small double-bowl sinks. It can also be used for connecting multiple fixtures to a single drain, such as a sink and dishwasher.
* **2 inch pipe:** This size is recommended for large double-bowl sinks and triple-bowl sinks. It can also be used for high-volume fixtures, such as garbage disposals.
### Factors to Consider
When choosing the diameter of the pipe for your kitchen sink, consider the following factors:
* **Sink size and type:** Larger sinks require larger diameter pipes to handle the increased water flow. Undermount sinks may also require different pipe sizes than top-mount sinks.
* **Number of fixtures:** If you are connecting multiple fixtures to a single drain, you may need a larger diameter pipe to accommodate the combined flow.
* **Local plumbing codes:** Plumbing codes may specify the minimum pipe diameter required for different types of fixtures and installations.
### Recommended Pipe Sizes
Here are some general recommendations for pipe sizes based on sink type and number of fixtures:
| Sink Type | Number of Fixtures | Recommended Pipe Diameter |
|—|—|—|
| Single-bowl sink | 1 | 1-1/2 inch |
| Double-bowl sink | 1 | 1-1/2 inch or 2 inch |
| Double-bowl sink | 2 | 2 inch |
| Triple-bowl sink | 1 | 2 inch |
| Triple-bowl sink | 2 | 2-1/2 inch or 3 inch |
**Note:** These are just general recommendations. Always consult with a licensed plumber to determine the best pipe size for your specific installation.
### Additional Considerations
In addition to the diameter of the pipe, there are a few other considerations to keep in mind when choosing piping for your kitchen sink:
* **Material:** Pipes can be made from a variety of materials, including copper, PVC, PEX, and CPVC. Each material has its own advantages and disadvantages, so it is important to choose the right one for your needs.
* **Slope:** Drain pipes must be installed with a slight slope to allow water to flow properly. The slope should be at least 1/4 inch per foot of pipe.
* **Traps:** Traps are devices that prevent sewer gases from entering the home. All drains must have a trap installed.
* **Venting:** Vents are pipes that allow air to enter the drain system. Vents help to prevent clogs and backups.
By following these guidelines, you can choose the right pipe size and materials for your kitchen sink and ensure that it drains properly for years to come.