Adjust Water Level Toilet Tank Fluidmaster

Turn the water on and watch it fill to see how the water level changes.

Adjust water level toilet tank fluidmaster. To adjust the water level in your toilet bowl start by removing the tank lid and noting if the water level looks too high or low. Adjusting the toilet tank water level with a fluidmaster model 400 fill valve does not require turning off the water to the tank. Turn the vertical adjuster screw at the top of the valve where the rod connects. Fill the bowl with a gallon of water.

For the newer style valve with the plastic adjustment rod turn the screw at the top of the rod to adjust the water level. If you hear water run use the adjustment screw at the inner end of the rod to raise the water level in the tank. If your fluidmaster fill valve has a leak guard attachment adjusting it is very similar to the procedure you would take when adjusting a toilet flapper s floater. After the water stops filling the tank the water level should be roughly inchbelow the top of overflow pipe to ensure a proper flush.

With a pencil draw a line at the top of the water level in bowl. Shortening the chain will make the leak guard more sensitive to potential leaks while adding slack to the chain will allow the system more leeway. Take the cover of the tank off and inspect the top of your fill valve for a dial or switch. Wait 1 minute until the bowl water level recedes down and stops.

Then turn off the water supply to the toilet by rotating the knob on the wall behind the toilet clockwise as far as it will go. If the valve is still filling and the water is up to the line in the bowl then the amount of water going into the bowl is too high and needs to be adjusted. This chain can be adjusted. If the water level is too high turn the dial to the right 1 2 rotations.

Water level is too low turn the tank water level adjustment screw clockwise to raise the float. Once the water is off check the float which is a plastic ball attached to a long arm at the top of the fill valve. Now flush the toilet. If the water level is too low turn the dial to the left 1 2 rotations.

The fill valve uses a float that moves up and down the valve rather than a float ball. If the fluidmaster fill valve has a stainless steel rod and clip adjust the water level by pinching the clip and sliding it up or down the rod to raise or lower the water level.