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Just installed a moen # 5350 a few hours ago - 24 May. #!1 It's hissing a water sound. #2 The water level is lower than the old one. #3 Every minute or so water leaks from under the round (top) part of the valve. The toilet was bought at the Re Store and the water fill valve in it, did the same things as the new one is doing now, except for the water level. It's so fragile looking I'm afraid to play with it too hard. What do I do short of calling in a plumber? -B.

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  • wandbwalsh May 25, 2011

    I installed a moen 5350 water fill valve a few hours ago. It is always running water. It hisses water. Every minite it runs water into the top of the float of the valve and into the 1 inch tube running down to the flapper.

    The height (the top)of this water fill valve is just below the top of the inside of the tank. The 1 inch tube attached to the flapper at the bottom of the tank is about 2 and 3/4 inches from the top of the tank. The water level is about an inch and a half below what it was.

    I don't know where (how high) the moen 5350 should be from the top of the tank. How do you move the yellow bar and why. IT came with NO instructions. The old water fill valve was behaving the same way except for the water level, so it was no help!

    Also, now as before, the amount of water in the bowl is A LOT. It measures 10 inches wide and the toilet takes forever to flush.
    PS- some bargain I got hey?



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The hissing is pretty normal for these valves...they make them louder intentionally so you know if they are running too often...
The reason it is going on every so often, is because the "flapper" that pulls up to let the water out of the tank is leaking and allowing water to run through into the bowl even when it is down... replace that.. also..

The tank water level can easily be adjusted...

Adjustment instructions


Posted on May 25, 2011

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Hi wandbwalsh,

There is a yellow tab at the top of the fill valve so you can adjust the water level.
The float arm should be 1" above the overflow pipe. This should have been adjusted during installation. If it is correct, simply adjust the float.
If the 1" above spec is not correct on yours, you would have to remove the moen and adjus it's height. You would do this by turning off the water supply to the toilet, removing the water supply line by removing the two plastic nuts at the bottom of the toilet, and removing moen and adjusting the height of the stem.
After these adjustments are made you should be good to go...

Hope this helps. If it does, I'd appreciate a 4 thumbs up. Thanks,

Handie Andie

Posted on May 25, 2011


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