The fill valve is the part of the toilet that is responsible for refilling the tank after being flushed. Over time, a worn or out of alignment fill valve can become a problem, cause a leak, and wear on valve’s components and parts. If your fill valve leaks, or if water continues to run after you flush, it may be time to replace the fill valve.


1 Disconnect Supply Line

disconnecting supply line for toilet valve


In most cases, the water supply valve is located on the wall behind the toilet. It must be off and drained before you begin this installation to solve the problem.

  • Shut off the water by turning the shutoff valve. Typically, you can turn the shutoff valve clockwise and continue turning the valve until it stops to stop water supply. 
  • Drain the tank by flushing the toilet. Hold the flush lever down to drain as much water as possible. A bucket or large cup can catch water as you drain.
  • Remove lid and float ball from tank to soak up any remaining water in the tank with a sponge.
  • Disconnect the old supply line.

If applicable, remove the refill tube from the overflow pipe holder and unhook the flapper chain from flush lever to provide space and ease for the installation.  

2 Remove Old Fill Valve

removing and replacing a toilet fill valve


The valve nut locks the toilet valve body into the toilet tank.  

  • Using adjustable pliers or adjustable wrench, remove the valve nut.
  • Remove and lift the fill valve from the tank. 
  • Wipe down the tank with a micro-fiber cloth to remove and remaining water, debris, or stains.

3 Adjust New Fill Valve

replacing a toilet fill valve


  • Toilets vary in size. Adjust the height of the toilet valve so the marking on top of the valve is at least 1 inch above the overflow tube.

4 Insert New Fill Valve and Connect Supply Line

reconnecting supply line to replace a toilet fill valve


The below installation directions are for replacing a fill valve, if you have a specific toilet fill valve kit, follow those instructions accordingly.

  • Place the valve shank onto the fill valve, then insert the fill valve base into the tank opening.
  • Push down on the valve shank and tighten the locknut as much as possible to seal the valve.
  • Reconnect the supply line to seal the flow of water.

5 Attach Refill Tube

reattach refill tube for toilet fill valve


  • Inside the tank, reattach the refill tube (if necessary, trim to avoid any kinks) and angle adaptor to the overflow pipe holder.

6 Adjust Water Level


adjust water valve to replace toilet fill valve

After all installation steps have been completed, it’s time to get your water flowing. Turn on and adjust the water supply to flush your toilet and test the installation.

  • Turn the water back on.
  • Allow the tank to fill.
  • Adjust the water level by squeezing the adjustment clip and moving the float up or down. On some models the float is adjusted using a threaded screw sitting next to the float.