1. Product Overview
The Pfister JX8-310A is a robust pressure balance tub and shower rough valve, meticulously constructed from solid brass. This valve is designed to provide a consistent water temperature and pressure for your tub and shower fixtures, enhancing your bathing experience. It is suitable for new installations and renovation projects, ensuring reliable performance and durability.

Image 1: The Pfister JX8-310A Tub and Shower Rough Valve, showcasing its solid brass construction and design.
2. Installation Instructions
Proper installation of the Pfister JX8-310A rough valve is crucial for optimal performance and safety. It is highly recommended that installation be performed by a qualified plumbing professional in accordance with all local plumbing and building codes.
2.1 Pre-Installation Checks
- Ensure all necessary tools and materials are available.
- Verify that the water supply lines are shut off before beginning any work.
- Confirm that the wall cavity is prepared for a 1-hole installation, as specified for this valve.
2.2 Mounting the Valve Body
- Position the valve body within the wall cavity, ensuring it is securely fastened to the framing.
- Ensure the valve is level and at the correct depth relative to the finished wall surface.
2.3 Connecting Water Lines
- Connect the hot and cold water supply lines to the designated inlets on the valve body. This model uses sweat connections.
- Connect the outlet lines to the tub spout and showerhead.
- Perform a leak test before closing the wall.

Image 2: An example of a rough valve installed within a wall, showing the necessary plumbing connections for hot, cold, tub, and shower lines.
3. Operating Instructions
The Pfister JX8-310A is a rough-in valve that controls the water flow and temperature for your tub and shower. Once a compatible trim kit (handle, escutcheon, tub spout, and showerhead) is installed, the valve's pressure-balancing mechanism will automatically adjust to maintain a consistent water temperature, even when other water sources in your home are in use.
- Temperature Control: The handle on your trim kit will allow you to adjust the water temperature.
- Flow Control: The handle also controls the water flow, turning it on and off.
- Diverter Function: If your trim kit includes a diverter, it will direct water between the tub spout and the showerhead.
4. Maintenance
To ensure the longevity and optimal performance of your Pfister JX8-310A rough valve, follow these general maintenance guidelines:
- Regular Cleaning: Once the trim kit is installed, regularly clean the external components with a soft cloth and mild soap. Avoid abrasive cleaners or harsh chemicals, as these can damage the finish.
- Leak Detection: Periodically check for any signs of leaks around the valve body or connections. Address any leaks promptly to prevent water damage.
- Professional Inspection: Consider having a qualified plumber inspect your plumbing system, including the rough valve, periodically to ensure everything is functioning correctly.
5. Troubleshooting
If you encounter issues with your tub and shower system, the problem may or may not be directly related to the rough valve. Here are some common issues and potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Inconsistent Water Temperature | Debris in valve, faulty cartridge, or issues with water heater. | Consult a plumber to inspect the valve cartridge or water heater settings. |
| Low Water Flow | Clogged showerhead/tub spout, partially closed shut-off valves, or plumbing issues. | Clean showerhead/tub spout. Ensure shut-off valves are fully open. If problem persists, contact a plumber. |
| Leaks from Valve Area | Loose connections, damaged seals, or faulty valve body. | Immediately shut off water supply. Contact a qualified plumber for inspection and repair. |
Note: For any complex issues or if you are unsure about performing repairs, always contact a certified plumber.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | JX8-310A |
| Brand | Pfister |
| Material | Brass |
| Item Dimensions (L x W x H) | 3.78 x 3.75 x 3.78 inches |
| Exterior Finish | Unfinished |
| Inlet Connection Type | Sweat |
| Outlet Connection Type | Sweat |
| Number of Ports | 2 |
| Outlet Connection Size | 0.5 Inches |
| Item Weight | 1.52 pounds |
| Installation Type | 1-hole installation |
7. Warranty and Support
7.1 Warranty Information
The Pfister JX8-310A Tub and Shower Rough Valve comes with a Lifetime Warranty. This warranty covers defects in material and manufacturing for the original consumer purchaser. For complete details regarding warranty coverage, terms, and conditions, please refer to the official Pfister website or contact Pfister customer service.
7.2 Customer Support
For technical assistance, parts replacement, or any questions regarding your Pfister product, please contact Pfister customer support. You can find contact information on the official Pfister website.
8. Related Information
Video 1: Why Pfister Brand Video. This video highlights Pfister's commitment to quality, innovation, and design in their faucet products, providing insight into the brand's philosophy.





