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.

Diaphragm Washer For 32mm 1¼ Cistern Float Valve Pack 5

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

💧 Fix leaks fast, stay ahead of the drip!

DIY ESSENTIAL - Perfect for quick, hassle-free repairs—ideal for the proactive homeowner or maintenance professional.
PRECISION FIT - Designed for 32mm (1¼") cistern float valves ensuring seamless compatibility and easy installation.
RELIABLE SEAL - Premium rubber material guarantees a watertight, long-lasting seal to prevent leaks and water waste.
BULK PACK EFFICIENCY - Five washers in one pack—always have spares ready for emergency repairs.
TRUSTED BRAND QUALITY - Thunderfix, a name synonymous with dependable plumbing solutions, backed by 925+ positive reviews.

This pack of five Thunderfix diaphragm washers is engineered for 32mm (1¼") cistern float valves, featuring durable rubber construction and compression thread fittings. Trusted by thousands, it offers a reliable, leak-proof seal that meets UK and EU standards, making it an essential, cost-effective solution for quick plumbing repairs.

Specifications

ASIN	B00YJEW5QU
Best Sellers Rank	39,355 in DIY & Tools ( See Top 100 in DIY & Tools ) 42 in Tap & Valve Washers
Brand	Thunderfix
Connector Type	Compression
Customer Reviews	4.5 out of 5 stars 925 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 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
Smart Home Compatibility	Not Smart Home Compatible
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

T**S

Good value

Perfect for quick repairs

7.12.2025

M**N

Toilet washer

Good product

2.05.2026

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

S**H

Buying the parts instead of the hole unit

Easy fitting will start getting all my parts on line know got 5 for the price of 1 in the shops

24.04.2025

E**E

Works fine

Does the job

26.11.2025

M**N

PO POSTAL SERVICE FOR SELLERS

Price and tracking was excellent, let down by the very late delivery by the PO. Arrived 17/11/23 at last!

17.11.2023

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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1810 som

Duties & taxes included

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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

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Details

Description

Specifications

Reviews

Common Questions