Plumbing Two Sinks To One Drain

Plumbing Two Sinks to One Drain: A Comprehensive Guide

Plumbing two sinks to a single drain is a common project for homeowners, offering space-saving solutions in bathrooms or utility rooms. This guide will walk you through the process, covering the necessary materials, steps involved, and important considerations to ensure a successful and code-compliant installation. This project is achievable for DIY enthusiasts with some basic plumbing experience, but always prioritize safety and consult a professional if unsure.

What you'll need:

• Drainpipe: Choose the correct diameter based on the sink drains (typically 1.5" or 2"). You'll need a length sufficient to connect both sinks to the main drain line. Consider using PVC or ABS pipes for their durability and ease of use.
• T-fitting: This crucial component allows you to connect the two sink drains into a single pipe. Ensure it matches the diameter of your drainpipe.
• Slip nuts and washers: These are necessary to secure the connections between the pipes and the sink drains.
• Elbows: You might need 45 or 90-degree elbows to navigate the space between the sinks and the main drain line, especially in tight spaces.
• PVC cement and primer: For a strong and leak-proof connection with PVC pipes.
• Plumber's putty: Use this around the sink drain flange to create a watertight seal.
• Measuring tape: Accurate measurements are crucial for cutting the pipes to the correct length.
• Pipe cutter or hacksaw: For cleanly cutting the PVC pipes.
• Level: Essential for ensuring the drainpipes are installed correctly and smoothly.
• Adjustable wrench: For tightening slip nuts and other connections.
• Safety glasses and gloves: Always prioritize safety when working with plumbing.

Step-by-Step Guide:

1. Preparation is Key: Turn off the water supply to both sinks. Disconnect the existing drainpipes from the sinks, keeping any components you can reuse. Clean all connections thoroughly. It's helpful to have a rough sketch of the plumbing layout before starting.

2. Measuring and Cutting: Measure the distance between the sink drain outlets and the location where the combined drain will connect to the main drain line. Cut your PVC pipes to the appropriate lengths using a pipe cutter for a clean, square cut.

3. Connecting the Sinks: Attach the drainpipes to each sink using plumber's putty around the flange for a watertight seal. Securely tighten the slip nuts and washers.

4. Installing the T-Fitting: Position the T-fitting at the point where the two drainpipes from the sinks will merge. Carefully apply PVC primer and cement to create a strong and leak-proof joint. Allow ample time for the cement to dry completely.

5. Connecting to the Main Drain: Connect the output of the T-fitting to the main drain line using the appropriate fittings and securing them with slip nuts and washers. Again, ensure all connections are tight and properly sealed.

6. Testing for Leaks: Once all connections are complete and the cement has dried, turn the water supply back on to both sinks and carefully check all connections for leaks. Look for any signs of dripping or water escaping the joints.

7. Adjustments and Refinements: If you find any leaks, carefully tighten the connections or reapply sealant as needed.

Important Considerations:

• Vent System: Ensure your plumbing system has a properly functioning vent system to prevent siphoning and ensure proper drainage.
• Slope: Maintain a consistent slope of at least 1/4 inch per foot for proper drainage. This ensures that waste water flows effectively towards the main drain.
• Local Codes: Familiarize yourself with local plumbing codes and regulations before beginning the project.

Troubleshooting:

• Slow Drainage: This often indicates a clog in the drainpipe. Try using a drain snake or plunger to clear the blockage.
• Leaks: Check all connections carefully. Tighten loose slip nuts or reapply sealant as needed. If the leak persists, you might need to redo the connection.

Plumbing two sinks to one drain can be a rewarding DIY project, resulting in a more organized and efficient bathroom or utility space. By following these steps and prioritizing safety, you can achieve a successful and long-lasting installation. Remember, if at any point you feel uncomfortable or unsure, it's always best to consult a qualified plumber.