Connecting an under-counter kitchen sink and a dishwasher to the same drain line is a common plumbing task in kitchen installations. To do this, you'll need some basic plumbing tools and materials. Please note that local plumbing codes may vary, so it's always a good idea to consult a professional plumber or check local regulations if you're unsure about any specific requirements.
Here's a step-by-step guide on how to connect an under-counter kitchen sink and dishwasher to the same dishwasher drain line:
Materials and Tools Needed:
- Dishwasher drain hose extension (if needed)
- Dishwasher drain hose clamp
- Sink drain tailpiece with dishwasher inlet
- P-trap kit
- Slip-joint pliers
- Screwdriver
- Adjustable wrench
- PVC cement (if using PVC pipes)
- Pipe cutter (if using PVC pipes)
Step 1: Shut off Water Supply and Disposal Power Before you start, turn off the water supply to the sink and the power supply to the dishwasher.
Step 2: Remove the Old Plumbing If you're replacing an existing sink and dishwasher, you'll need to disconnect and remove the old plumbing. Use slip-joint pliers and an adjustable wrench to disconnect the sink's drain and the dishwasher drain hose from the existing drain line.
Step 3: Install the P-Trap The P-trap is a U-shaped pipe that prevents sewer gases from entering the kitchen. It also traps debris to prevent clogs. Install the P-trap under the sink using the provided kit. Make sure it has an inlet for the dishwasher.
Step 4: Prepare the Dishwasher Drain Hose Some dishwashers come with a short drain hose, which may need an extension to reach the sink's drain or the P-trap. If required, attach a dishwasher drain hose extension to the dishwasher's existing drain hose. Secure it with a hose clamp.
Step 5: Connect the Dishwasher Drain Hose Connect the dishwasher drain hose (extended or not) to the inlet on the P-trap meant for the dishwasher. Secure it with a hose clamp to ensure it stays in place.
Step 6: Connect the Sink Drain Tailpiece Attach the sink drain tailpiece to the sink's drain opening. This piece will act as the outlet for your sink's drain.
Step 7: Connect the Sink Drain to the P-Trap Connect the sink drain tailpiece to the P-trap's inlet using a slip-joint nut and washer. Use slip-joint pliers to tighten the connection securely.
Step 8: Check for Leaks Before using the sink or dishwasher, turn on the water supply and check for any leaks around the connections. If you notice any leaks, tighten the connections as needed.
Step 9: Test the Dishwasher Run the dishwasher to ensure that it drains properly into the shared drain line and that there are no leaks.
Step 10: Check Local Regulations After completing the installation, verify that your setup complies with local plumbing codes and regulations. If necessary, schedule an inspection to ensure everything is up to code.
Remember, if you're not comfortable with plumbing tasks or encounter any issues during the installation process, it's best to seek help from a professional plumber to avoid potential problems or damage.