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

💧Durable rubber for leak-proof seal

🔧32mm / 1¼" compression fit

🛠️5-pack for multiple repairs

RM52

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Description

💧 Fix leaks fast, stay dry longer!

PRECISION FIT - Designed for 32mm (1¼") compression float valves for seamless installation
TRUSTED QUALITY - Thunderfix brand with 4.5-star rating from 927 users—reliable and proven
BULK REPAIR READY - Pack of 5 washers ensures you're always stocked for quick fixes
LEAK RESISTANT RUBBER - Premium rubber exterior guarantees a watertight seal every time
UNIVERSAL COMPATIBILITY - Meets UK & EU standards, perfect for most cistern float valves

The Thunderfix Diaphragm Washer pack includes 5 durable rubber washers designed for 32mm (1¼") compression float valves. Engineered for a precise, leak-proof fit, these washers meet UK and EU standards and come from a trusted brand with high customer satisfaction, making them an essential, reliable choice for efficient cistern repairs.

Specifications

ASIN	B00YJEW5QU
Best Sellers Rank	22,901 in DIY & Tools ( See Top 100 in DIY & Tools ) 21 in Tap & Valve Washers
Brand	Thunderfix
Connector Type	Compression
Customer Reviews	4.5 out of 5 stars 927 Reviews
Exterior Finish	Rubber
Exterior finish	Rubber
Inlet Connection Size	1.25 Inches
Inlet Connection Type	Compression
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
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

M**N

Toilet washer

Good product

2.05.2026

E**E

Works fine

Does the job

26.11.2025

B**S

Very good

Did the job

3.05.2026

A**R

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

T**S

Good value

Perfect for quick repairs

7.12.2025

A**R

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

C**S

Short

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

2.09.2024

N**.

Good item

Pleased with item quickly delivered

9.10.2025

M**C

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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RM52

Duties & taxes included

In stock

Sold byAmazon MalaysiaDelivered 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 Malaysia.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

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

5 days ago

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1 month ago

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