1. Product Overview
The Cornat TEC317405 is an excenter drain valve designed for use in plumbing systems, typically for sinks or basins. It features a pull rod mechanism for opening and closing the drain. Constructed from brass with a chrome finish, this valve is engineered for reliable performance and durability.
Key features include:
- Material: Brass, chrome-plated finish
- Valve bottom part: Brass
- Connection size: 1 1/4 inches external thread
- Mechanism: Integrated crossbar and lock for pull rod operation

Figure 1: Cornat TEC317405 Excenter Drain Valve, showing the main body and pull rod mechanism.
2. Safety Information
Please read and understand all instructions before installation and use. Failure to follow these instructions may result in property damage or personal injury.
- Always shut off the main water supply before beginning any plumbing work.
- Wear appropriate personal protective equipment, such as safety glasses and gloves.
- Ensure all connections are properly sealed to prevent leaks.
- If you are unsure about any part of the installation process, consult a qualified plumber.
- Do not overtighten connections, as this can damage components.
3. Package Contents
Verify that all components are present before beginning installation:
- 1x Cornat TEC317405 Excenter Drain Valve (main body with upper and lower valve parts)
- 1x Pull rod with crossbar and locking mechanism
- Sealing gaskets (typically included for installation)
4. Specifications
| Feature | Detail |
|---|---|
| Model Number | TEC317405 |
| Brand | Cornat |
| Material | Brass |
| Finish | Chrome |
| Connection Size | 1 1/4 inch external thread |
| Drain Opening Diameter (B) | Ø 62 mm (approximate, refer to diagram) |
| Package Dimensions | 27.9 x 7.4 x 6.6 cm |
| Weight | 284 grams |

Figure 2: Technical diagram illustrating the dimensions of the excenter drain valve. 'A' typically refers to the thread size (1 1/4") and 'B' to the top drain opening diameter (approx. 62mm).
5. Installation
This section provides general guidance for installing the excenter drain valve. Specific installation steps may vary depending on your sink or basin type. Always refer to your sink manufacturer's instructions if available.
- Prepare the Sink Opening: Ensure the drain opening in your sink is clean and free of debris.
- Apply Sealant (Optional, but Recommended): Apply a thin bead of plumber's putty or silicone sealant around the underside of the drain flange (the top part of the valve that sits inside the sink). This helps create a watertight seal.
- Insert Upper Valve Part: Place the upper part of the drain valve (with the flange) into the sink's drain opening from above.
- Attach Lower Valve Part: From underneath the sink, slide any necessary gaskets or washers onto the threaded portion of the valve. Then, thread the lower valve body onto the upper valve part. Hand-tighten first.
- Align and Tighten: Ensure the drain valve is properly centered and aligned. Use a basin wrench or appropriate tool to carefully tighten the lower valve body. Do not overtighten. The sealant should squeeze out slightly, indicating a good seal. Wipe away excess sealant.
- Connect Pull Rod: Insert the pull rod into the designated opening on the side of the lower valve body. Secure it using the provided crossbar and locking mechanism. Ensure the pull rod moves freely and operates the internal stopper.
- Connect to P-Trap: Connect your P-trap assembly to the 1 1/4 inch external thread of the drain valve. Ensure all P-trap connections are sealed with appropriate washers and tightened securely.
- Test for Leaks: Once all connections are made, turn on the water supply and fill the sink. Observe carefully for any leaks around the drain valve and P-trap connections. Tighten any leaking connections slightly if necessary.
6. Operation
The Cornat TEC317405 excenter drain valve is operated by a pull rod, typically located behind the faucet on the sink or basin.
- To Close the Drain: Pull the rod upwards. This action will lower the stopper inside the drain, sealing the opening and allowing the sink to fill with water.
- To Open the Drain: Push the rod downwards. This action will lift the stopper, allowing water to drain from the sink.
Ensure the pull rod moves smoothly. If it feels stiff, check for obstructions or misalignment in the mechanism underneath the sink.
7. Maintenance
Regular maintenance helps ensure the longevity and proper function of your drain valve.
- Cleaning: Clean the visible chrome surfaces with a soft cloth and mild, non-abrasive cleaner. Avoid harsh chemicals or abrasive pads, as these can damage the chrome finish.
- Stopper Cleaning: Periodically remove the drain stopper (by detaching the pull rod from the crossbar if necessary) and clean any accumulated hair or debris. This helps maintain proper drainage.
- Leak Inspection: Regularly check underneath the sink for any signs of leaks around the drain valve and P-trap connections. Address any leaks promptly to prevent water damage.
- Pull Rod Function: Ensure the pull rod operates smoothly. If it becomes stiff, check for corrosion or debris around the pivot points and clean as needed.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Water leaking from under the sink | Loose connections, damaged gaskets, improper sealant application. | Check and tighten all connections. Inspect and replace damaged gaskets. Reapply plumber's putty or sealant if necessary. |
| Slow drainage | Hair or debris accumulated around the stopper or in the P-trap. | Remove and clean the drain stopper. Clean the P-trap if necessary. |
| Pull rod is stiff or not operating the stopper | Misalignment of the pull rod, corrosion, or debris in the mechanism. | Check the connection of the pull rod to the crossbar. Clean any visible corrosion or debris. Ensure the rod moves freely. |
| Stopper does not seal completely | Debris under the stopper, stopper not seating correctly, or pull rod adjustment issue. | Clean under the stopper. Adjust the pull rod mechanism to ensure the stopper fully closes. |
9. Warranty and Support
For warranty information and customer support, please refer to the documentation provided at the point of purchase or contact your retailer. You may also visit the official Cornat website for further assistance.