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I have installed a fluidmaster 400 bottom inlet

I have installed a fluidmaster 400 bottom inlet valve to a gravity fet cysten. water comming out slow. help

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  • Anonymous Mar 13, 2014

    water flow sometimes does not shut off

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I have installed 400A or 400LS valves on systems as low as 30psi, but below that I don't know that it would work very well if you needed it to fill faster.

Keep in mind that your pressure to the toilet will be 1/2psi for every foot above the fill level of the tank, which is reduced by friction loss in the pipe and fittings on the way to the toilet.

Posted on Oct 27, 2009

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Posted on Jan 02, 2017

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Fluidmaster 400 manual


Why is the water leaking out of the tank? There's only reason for that, the water is slowly leaking by the plunger.check the plunger aT The bottom of the tank it's activated by the handle.shut the water supply off empty the tank,clean the bottom of the plunger refill tank .problem should be fixed if not replace plunger.. Happy plumbing.

Sep 01, 2014 | Fluidmaster Water Saving Easy Fix 400...

1 Answer

Fluidmaster 400


I installed a fluidmaster 400 and the refill cycle is very noisy. You can hear the water running thirty feet away. Any thought?

Aug 12, 2013 | Plumbing

1 Answer

Fluidmaster 400


Change flush valve, it comes with tank to toilet gasket, which sounds like your problem.

Aug 11, 2013 | Plumbing

1 Answer

Brand new fluidmaster 400 installed but toilet still leaking


Is The water leaking in or out check the stopper is good and that it is seating right

May 13, 2012 | Fluidmaster Plumbing

1 Answer

My fluidmaster 400 anti siphon for toilet will not stop filling making pump run over and over


Hi turtlerose07...

Sounds like you have one or two problems with the fluidmaster 400.
1...The float is set too high allowing the water to overflow into the overflow pipe and allowing your pump to run too much.
2...Flapper valve inside at the bottom of the tank is not sealing properly, thus allowing water to leak and causing the fluidmaster to keep trying to fill the tank with water and causing the pump to run too much.
Please take time to rate me

Aug 24, 2011 | Home

1 Answer

Since I replaced the insides of my toilet with the fluidmaster 400 anti siphon, the water seems to no refill the tank after I flush the toilet.


You are going to have to adjust the valve you just installed. Most can be adjusted by pulling a ring close to the bottom upward and pulling the neck of the valve up, in turn adjusting the water level in the tank. There should be instructions in the box on how to raise the water level.

Jun 21, 2011 | Home

2 Answers

The fill valve must be clogged. But I can't get the cap off. How do I rotate it while holding up the arm? Is there some trick I am missing? It is a 400 series


The cap will pop off(just a little pressure be careful not to break tabs)then rotate top with arm 1/4 turn then lift valve assembly out there is a diaphragm remove(be sure water to valve is off!!)then turn water on slowly that will flush out inlet tube then you have to clean rubber diaphragm very good(hot water is better to clean diaphragm off with)if that doesn't work you can get new diaphragm from plumbing,hardware,or home improvement stores.

Jun 04, 2011 | Fluidmaster Plumbing

1 Answer

We replaced our 3 toilets with the Fluidmaster 400 and have had problems ever since. All the toilets are running water every 5 to 10 minutes and my water bill has doubled. What can we do?


Hello- If you replaced old ball and rod set with new fluidmasters they will most likely need to be adjusted, not all toilet tanks are of equal height. You will have to adjust water height,meaning you must keep water level below fill tube located in center of the toilet tank. Adjustment is done from bottom of the fluidmaster, they screw in and out to adjust height. You will notice threads along the bottom part of the fluid master, on the inside of the tank,they adjust up & down! Goodluck!

May 19, 2011 | Home

2 Answers

After flush tank refills very slowly


Make sure that any valves that you shut to install the fill valve are fully open after the installation.

If that doesn't work, the following is from another fix your stuff site:
Shut off water supply. Lift the rod arm and remove top cap assembly by turning 1/8 turn counterclockwise. Using a straightened coat hanger, carefully clean out the inlet passage of the Valve.

If these don't help, check the model number of your Fluidmaster and include that the next time you write.

Dec 09, 2010 | Fluidmaster INC #B1F09 9" Faucet Connector

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