Fluidmaster Replacement Seal for Model #400A Fill Valves-242 - The Home Depot


Model # 242

Internet # 100580550

Store SKU # 147982

Replacement Seal for Model #400A Fill Valves

Fluidmaster Replacement Seal for Model #400A Fill Valves

This item has been discontinued.
The Home Depot no longer carries this specific product.

$2.75 / each


Model # 242

Internet # 100580550

Store SKU # 147982

The Fluidmaster Replacement Seal for Model #400A Fill Valves is a great way to repair a Fluidmaster 400A fill valve without needing to purchase a new fill valve. The seal can also be used with the Home Depot-exclusive Whisper series of fill valves.

  • Durable rubber construction
  • Replaces the seal on Fluidmaster model #400A fill valves without needing to replace the entire fill valve
  • Fits the Home Depot-exclusive Whisper series of fill valves
  • Extends the life of the fill valve
  • Easy to repair

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.


Assembled Depth (in.)  .565 in  Assembled Height (in.)  4.75 in 
Assembled Width (in.)  3.75 in  Inside Diameter  .02 in 
Outside Diameter  .5 in 
Chemical resistant  Yes  Plumbing Part Type  Toilet Flush & Fill Valve 
Returnable  90-Day 
Warranty / Certifications
Manufacturer Warranty  1 Year 


Rated 4.9 out of 5 by 9 reviewers.
Rated 4.0 out of 5.0 by HydroClean Fill Valve Replacement Seal Just wanted to let everyone know that this part also fits HydroClean Toilet Fill Valve's perfectly. It say's that it's a replacement seal for Fluidmaster 400A Fill Valve's but it will also fit the HydroClean. My toilet wasn't filling up with water and water was trickling out from the top. Once I removed the old seal, I noticed a tiny tear. Almost impossible to see unless you really start looking real close. It only takes a tiny tear or hole to ruin everything. You will have to remove the blue cap very carefully. The two bottom prongs are easy to disengage but the top one is tricky. You will need a tiny flat head screwdriver with a very narrow head. Once its off, you will need needle nose pliers that are long and very slender to remove the tiny plastic pin that holds the gray arm to the white round part of the valve. Once removed, lift the white locking arm with the small screwdriver and rotate the white part counterclockwise to get to the seal. Then using the tiny screwdriver again, gently insert it between the seal and the white round part to remove the seal. November 30, 2014
Rated 5.0 out of 5.0 by Great Toilet Fix wish they advertised this better As preventative maintenance I just change this part about every 2-3 years on all my toilets. I didn't know this was the only rubber seal inside a fludmaster fill valve until I did some research. These wear out from chlorine in the water so expect to replace them every few years. I also flush out the cap when I change this and a few times I've gotten small rocks inside the cap. I have a extra whole house filter on my water line too. Also I showed this to my uncle since he's a pretty handy guy and he didn't know this is why fluidmasters won't turn off. After figuring this out I haven't switched out a fluidmaster assembly in over 5 years but I've put in probably 20 of these washers(showed it to friends and family) December 5, 2014
Rated 5.0 out of 5.0 by Easy 30-second Fix If you're having issues with your tank refilling after flushing then this is probably the part you need. Both of my fill valves went bad about a month apart, roughly 2-3 years after I installed each of them. It's a shame the part wears out so quickly, but at least it's a cheap and easy repair. May 22, 2013
Rated 5.0 out of 5.0 by You need this! If you already have one of the 400 series valves installed you want a few of these on hand. It seems like every three years or so the valves start leaking from use and chlorine in the city water. In the past, I would go get a whole new valve for $12-14 and spend a half hour or so laying under the toilet replacing everything then dealing with the obligatory spot leaks. This seal is normally the culprit and can be replaced in just a minute with no tools and its right at the top of the tank. I keep a full 400 kit on hand with the flapper [the other part that gets hard from the chlorine] but most of the time its this seal. Pop a new one in and DONE! Then I pick up another spare on my next run to the store for next time. March 4, 2014
Rated 5.0 out of 5.0 by This Is The Genuine Replacement Part ... I Reccomend Having This Piece At Home For A Spare ... When The Seal Goes Bad , It Only Takes A Minute To Repair The Fill Valve ... December 6, 2011
2 >>


Cost Saver Shipping includes initial transportation by small parcel service, with final delivery made by U.S. Postal Service. Tracking information may be limited.

Orders for this item may be expedited for an additional fee.

Other Delivery Options:

Standard Shipping includes delivery by small parcel service. Processing time varies by product.

Express and Expedited shipping options are also available. Estimated arrival times are available in checkout.

If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.