How to Replace Toilet Fill Valve
A faulty fill valve causes running toilets, slow tank refills, or hissing sounds. Replacing it is a simple DIY repair that saves water and prevents damage.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Turn Off Water Supply
Step 1: Turn Off Water Supply
Locate the shut-off valve under the toilet and turn it clockwise. Flush toilet to empty the tank.
Adjustable Wrench Set
Plumbing wrench set for toilet connections
2 Step 2: Disconnect Water Supply Line
Step 2: Disconnect Water Supply Line
Place a bucket or towels under the connection. Use adjustable wrench to disconnect the supply line from the bottom of the tank.
Wet/Dry Vacuum
Shop vac for removing water from toilet tank
3 Step 3: Remove Old Fill Valve
Step 3: Remove Old Fill Valve
Unscrew the lock nut holding the fill valve in place. Lift out the old valve and clean the tank opening.
Universal Fill Valve
Adjustable height toilet fill valve
4 Step 4: Install New Fill Valve
Step 4: Install New Fill Valve
Insert new valve through tank opening. Hand-tighten lock nut from underneath, then use wrench for final quarter turn.
Teflon Tape
Thread seal tape for plumbing connections
5 Step 5: Adjust Height and Reconnect
Step 5: Adjust Height and Reconnect
Adjust valve height so water level is 1 inch below overflow tube. Reconnect supply line and hand-tighten connection.
Toilet Tank Bolts
Stainless steel tank-to-bowl bolt kit
6 Step 6: Turn On Water and Test
Step 6: Turn On Water and Test
Slowly turn on water supply. Check for leaks and adjust float to achieve proper water level. Verify toilet flushes properly.
Toilet Repair Kit
Complete repair kit with flapper and fill valve