It’s relatively easy to repair a toilet fill valve if you happen to have a Fluidmaster valve. Usually, fixing a fill valve is performed by just substituting the complete fill valve, but Fluidmaster fill valves can be done by just substituting a seal within the unit. If your Fluidmaster fill valve isn’t closing down all the way or not filling fast like it used to be when it was new, then replacing the fill valve seal will most probably sort out the issue.
Not sure how to replace your Fluidmaster Fill Valve Seal? Here is a step-by-step guide:
Close the water flow to the toilet by rotating the handle on the shutoff valve clockwise until it stops.
Then flush your toilet to take off most of the water present in the tank
Untie the plastic lid located on zenith of the fill valve: enfold one hand around the fill valve tube, then slide it to thrust the float cup up towards the summit of the fill valve, and grab the shaft steadfastly. Make use of your other hand to rotate the lid on summit of the fill valve counterclockwise 1/8 of a turn. It may aid to push down on the lid while rotating.
Elevate the lid from the crown of the valve & put to one side.
Put a mug upside down over the top of the valve & keep it in place with one hand.
Make use of your other hand to cautiously open the shutoff valve by rotating it counterclockwise. Waters will stream out of the fill valve, into the mug, and then down into the toilet tank. This will flush away any wreckage from the valve. Close the shutoff valve by turning clockwise until it stops.
Take off the existing fill valve from the valve lid.
Fit the new valve seal, placing the nipple on the seal over the steel needle in the lid so the nipples goes up into the cap; this must match the placement of the existing seal.
Install the fill valve cap again by fitting it onto the valve as before and rotating 1/8 clockwise to lock the lit in position.
Slowly open the shutoff valve by rotating counterclockwise until the handle stops.
To conclude the task, allow the valve to refill the toilet tank, and then flush the toilet & check out the operation of the fill valve. Also check if there’s any leak at the shutoff valve.
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