Inlet valve won't close off water. What's the problem

Diaphragm washer wrong way round?/needs new washer/o-ring? /swing arm needs adjustment? Try looking on Youtube

need a replacement plastic retaining clip, that holds these in the housing,(edges disintegrating).anyone know where?

Had the same problem but unable to find a separate part - replaced the complete housing cylinder for less than £3

Will this fit a Dudley inlet valve?

Sorry no idea what a Dudley inlet valve is. I have fitted this type of washer in about 4 different properties over many years to various cisterns

Is this the part that stops that horrendous noise when you flush. Is it a generic size?

The diaphragm washer is to stop the flow of water when the water tank is full , it's also called a ball valve. The noise you hear when re-filling the tank can be reduced if you are able to reduce the water pressure and slow down the flow. This can be done outside the tank on the incoming water supply (copper pipe) if you have a shutoff valve which shuts off the water and can be adjusted with a small screwdriver.The diaphragm washer won't stop the noise.

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Diaphragm Washer for 32mm/1¼" Cistern Float Valve (Pack of 5)

Product ID: 53848431

Details

Brand
Thunderfix
Exterior finish
Rubber
Inlet connection size
1.25 Inches
Inlet connection type
Compression
Material
Rubber
Number of ports
5

🔧Compression thread type

♻️Durable rubber material

🛠️Precision 32mm/1¼" fit

C$318

Duties & taxes included

In stock

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Description

🚿 Seal the deal with Thunderfix precision!

TRUSTED BRAND QUALITY - Thunderfix, a name synonymous with plumbing excellence and customer satisfaction.
PERFECT FIT EVERY TIME - Specifically engineered for 32mm/1¼" cistern float valves ensuring leak-free performance.
ROBUST RUBBER CONSTRUCTION - Premium rubber ensures long-lasting durability and reliable sealing under pressure.
PACK OF 5 FOR ULTIMATE VALUE - Keep your plumbing maintenance hassle-free with a ready supply of washers.
COMPRESSION THREAD COMPATIBILITY - Designed for easy installation with standard compression inlet and outlet connections.

This pack of five Thunderfix diaphragm washers is designed for 32mm/1¼" cistern float valves, featuring durable rubber construction and compression thread compatibility for a secure, leak-proof fit. Ideal for professional-grade plumbing maintenance, these washers meet UK and EU standards, ensuring reliable performance and value.

Specifications

Asin	B00YJEW5QU
Best Sellers Rank	46,357 in DIY & Tools (See Top 100 in DIY & Tools) 47 in Tap & Valve Washers
Brand	Thunderfix
Connector Type	Compression
Customer Reviews	4.5 4.5 out of 5 stars (927) 4.5 out of 5 stars
Exterior Finish	Rubber
Inlet Connection Size	1.25 Inches
Inlet Connection Type	Compression
Manufacturer	Thunderfix
Material	Rubber
Model Number	100087
Number Of Items	5
Number Of Pieces	5
Number Of Ports	5
Outlet Connection Size	1.25 Inches
Outlet Connection Type	Compression
Part Number	100087
Set Name	5
Size	32mm / 1 1/4 inches
Specification Met	UK and EU standards (specific not stated)
Thread Size	1¼"
Thread Type	Compression
Unit Count	5.0 count
Valve Type	Float Valve

Reviews

User

Toilet washer

Good product

2.05.2026

User

Works fine

Does the job

26.11.2025

User

Very good

Did the job

3.05.2026

User

Diaphragm washers

My cistern was making a terrible noise when flushed I looked for a video to see if I could fix the problem myself. They said it was just the diaphragm washer looked them up and found these washers. They were so easy to change over I would recommend them it has saved me a lot of money.

6.02.2024

User

Good value

Perfect for quick repairs

7.12.2025

User

Have I Made The Right Choice

My toilet sounded like a foghorn after flushing, would have had to buy a complete float valve kit from Jacksons, This was a simple task to fix, perfect replacement, now no more foghorn and four spares for the other toilets, very pleased.

3.10.2022

User

Short

The stated five-pack of ball-valve washers only contained four.

2.09.2024

User

Good item

Pleased with item quickly delivered

9.10.2025

User

Super j'ai une chasse d'eau neuve

21.08.2019

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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2 months ago

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C$318

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

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