1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your BrassCraft BCT005 Hornet V Universal Toilet Flapper. Designed for universal fit, this flapper is constructed from premium engineered vinyl and includes a plastic, no-rust, no-kink chain for reliable performance. Please read these instructions carefully before proceeding with installation or maintenance.
2. Safety Information
Always prioritize safety when working with plumbing. Failure to follow these safety guidelines may result in property damage or personal injury.
- Turn off Water Supply: Before beginning any work on your toilet, locate and turn off the water supply valve, typically found on the wall behind or near the toilet. Flush the toilet to drain the tank.
- Wear Protective Gear: Consider wearing gloves and eye protection to prevent contact with water or cleaning agents.
- Handle Tools Safely: Use appropriate tools for the task and handle them with care to avoid injury.
3. Package Contents
Verify that all components are present before beginning installation:
- 1 x BrassCraft BCT005 Hornet V Universal Toilet Flapper with attached chain
4. Setup and Installation
Follow these steps to install or replace your toilet flapper:
- Prepare the Toilet: Turn off the water supply to the toilet and flush to empty the tank.
- Remove Old Flapper (if applicable): Disconnect the old flapper's chain from the flush lever. Unhook the old flapper from the overflow tube ears or remove it from the flush valve seat.
- Clean Flush Valve Seat: Thoroughly clean the flush valve seat at the bottom of the tank. Any debris or mineral buildup can prevent a proper seal.
- Install New Flapper: Position the BrassCraft BCT005 Hornet V flapper over the flush valve opening. Secure the flapper's ears onto the overflow tube's attachment points. Ensure it sits flat and centered on the flush valve seat.
- Connect Chain: Attach the flapper's chain to the toilet's flush lever arm.
- Adjust Chain Length: The chain should have minimal slack (approximately 1/2 inch to 1 inch) when the flapper is closed. Too much slack will prevent a full flush; too little slack will prevent the flapper from sealing completely, causing leaks. Adjust by moving the hook to a different link on the chain.
- Restore Water Supply: Turn the water supply back on and allow the tank to fill.
- Test Flush: Flush the toilet several times to ensure the flapper lifts correctly, allows a full flush, and then seals completely to stop water flow into the bowl. Listen for continuous running water, which indicates a leak.

Image: The BrassCraft BCT005 Hornet V Universal Toilet Flapper, showing its yellow vinyl construction and attached black plastic chain with a hook for connection to the flush lever.
5. Operating Instructions
The BrassCraft BCT005 Hornet V flapper operates automatically as part of your toilet's flushing mechanism. When the flush lever is pressed, the chain lifts the flapper, allowing water from the tank to flow into the toilet bowl. Once the tank is sufficiently empty, the flapper returns to its sealed position on the flush valve seat, stopping water flow and allowing the tank to refill.
6. Maintenance
Regular maintenance ensures the longevity and efficiency of your flapper:
- Inspect for Leaks: Periodically check for signs of a leaky flapper, such as a toilet that runs intermittently or continuously without being flushed.
- Clean the Flapper and Seat: Over time, mineral deposits or debris can accumulate on the flapper or the flush valve seat, preventing a proper seal. Turn off the water, drain the tank, and gently clean the flapper and the rim of the flush valve seat with a soft brush or cloth. Avoid abrasive cleaners.
- Check Chain Condition: Ensure the chain is not tangled, broken, or corroded. The plastic chain included with this flapper is designed to resist rust and kinking.
- Avoid Tank Cleaners: Certain drop-in tank cleaners containing harsh chemicals can degrade flapper materials over time. It is recommended to avoid their use to prolong the life of your flapper.
7. Troubleshooting
If you encounter issues with your toilet's flushing mechanism, consider the following:
- Toilet Runs Continuously:
- Chain Too Short: The chain may be too tight, preventing the flapper from fully closing. Adjust the chain to have a small amount of slack.
- Obstruction: Debris or mineral buildup on the flush valve seat or under the flapper can prevent a proper seal. Clean the area thoroughly.
- Worn Flapper: Over time, flappers can degrade. If cleaning and adjustment do not resolve the issue, the flapper may need replacement.
- Weak or Incomplete Flush:
- Chain Too Long: Too much slack in the chain may prevent the flapper from lifting high enough or staying open long enough for a full flush. Adjust the chain to reduce slack.
- Water Level Too Low: Ensure the water level in the tank is at the recommended fill line. Adjust the fill valve if necessary.
8. Specifications
| Brand | BrassCraft |
| Model Number | BCT005 |
| Product Name | Hornet V Universal Toilet Flapper |
| Material | Vinyl |
| Color | Yellow |
| Item Weight | 1.6 ounces |
| UPC | 026613116761 |
9. Warranty and Support
For information regarding product warranty or technical support, please refer to the BrassCraft official website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
BrassCraft Manufacturing Co.
Website: www.brasscraft.com
(Please note: This link is for informational purposes and may not be active or lead to specific support pages.)