NuFlush 28219
NuFlush 3-Inch American Standard Toilet Seat Disc Instruction Manual
Model: 28219
1. Introduction
This manual provides instructions for the installation, operation, and maintenance of the NuFlush 3-inch Flush Seat Disc, Model 28219. This product is a replacement part designed for specific American Standard toilet models.
Product Description: The NuFlush 3-inch Flush Seat Disc is a black rubber replacement part for the flush valve seal in compatible toilets. It ensures a proper seal for efficient flushing.
Compatibility: This seat disc is specifically designed for use with American Standard Heritage one-piece toilets and Lexington one-piece round front and elongated toilets.
2. Safety Information
- Always turn off the water supply to the toilet before beginning any installation or maintenance.
- Flush the toilet to drain the tank before opening it.
- Wear appropriate personal protective equipment, such as gloves, to maintain hygiene.
- Keep small parts away from children.
- If you are unsure about any step, consult a qualified plumber.
3. Package Contents
- 1 x NuFlush 3-Inch American Standard Toilet Seat Disc (Model 28219)
4. Installation Instructions
Follow these steps to replace the toilet seat disc:
- Turn off Water Supply: Locate the shut-off valve behind or near the base of the toilet and turn it clockwise until the water flow stops.
- Drain Toilet Tank: Flush the toilet to empty the water from the tank. Hold the flush handle down until most of the water has drained.
- Remove Tank Lid: Carefully lift the toilet tank lid and set it aside in a safe place.
- Locate Flush Valve Assembly: Identify the flush valve assembly at the bottom center of the tank. The existing seat disc will be attached to this assembly.
- Remove Old Seat Disc: The old seat disc is typically a snap-on attachment. Gently unclip or detach the old disc from the flush valve. Note how it was attached for reference.
- Install New Seat Disc: Take the new NuFlush 3-inch seat disc. Align it with the flush valve assembly and snap it into place. Ensure it is securely fastened and forms a tight seal.
- Restore Water Supply: Turn the water shut-off valve counter-clockwise to restore the water supply to the toilet tank. Allow the tank to refill.
- Test Flush: Once the tank is refilled, flush the toilet several times to check for proper operation and ensure there are no leaks. Observe the disc's movement and the seal it creates.
- Replace Tank Lid: Carefully place the tank lid back onto the toilet tank.

Image 1: The NuFlush 3-inch toilet seat disc, made of black rubber, positioned next to a stainless steel ruler. The ruler indicates the disc's diameter is approximately 3 inches, confirming its size for compatibility with American Standard toilets.
5. Operating Instructions
Once installed, the NuFlush 3-inch Flush Seat Disc operates automatically as part of your toilet's flush mechanism. When the flush handle is pressed, the disc lifts to allow water to flow from the tank into the bowl, initiating the flush cycle. Upon release of the handle, the disc returns to its seated position, creating a watertight seal at the bottom of the tank, allowing it to refill.
6. Maintenance
- Regular Inspection: Periodically inspect the seat disc for signs of wear, cracking, or deterioration. A worn disc can lead to leaks and inefficient flushing.
- Cleaning: If mineral deposits or debris accumulate on the disc or the flush valve seat, turn off the water supply, drain the tank, and gently clean the surfaces with a soft brush and mild cleaner. Avoid abrasive cleaners that could damage the rubber.
- Replacement: If the disc shows significant wear or is no longer forming a proper seal, replace it with a new NuFlush 3-inch seat disc.
7. Troubleshooting
- Toilet Runs Continuously:
- Cause: The seat disc may not be seating properly, or it could be worn.
- Solution: Check for any obstructions preventing the disc from sealing. Inspect the disc for wear or damage. If damaged, replace the disc.
- Weak Flush:
- Cause: The disc might be lifting too slowly or not fully, or there could be an issue with the overall flush mechanism.
- Solution: Ensure the disc is installed correctly and moves freely. If the disc is old, consider replacing it.
- Leaks from Tank into Bowl:
- Cause: The seat disc is not creating a watertight seal.
- Solution: Inspect the disc for debris, mineral buildup, or damage. Clean or replace the disc as necessary.
8. Specifications
| Manufacturer | NuFlush |
| Part Number | 28219 |
| Material | Rubber |
| Size | 3 Inch Diameter |
| ASIN | B099LXVMCM |
| Date First Available | July 15, 2021 |
9. Warranty and Support
This NuFlush product is covered by the manufacturer's standard warranty. For specific warranty details, please refer to the product packaging or contact NuFlush customer support directly.
For technical assistance or further inquiries, please visit the NuFlush Store on Amazon or contact NuFlush customer service.
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