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)

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

Rp233479

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Description

🚿 Upgrade your flush game with leak-proof precision!

TRUSTED BY THOUSANDS - Rated 4.5 stars by 927 users—join the savvy pros who rely on Thunderfix quality.
PERFECT FIT EVERY TIME - Specifically engineered for 32mm/1¼" cistern float valves ensuring leak-free performance.
ROBUST RUBBER CONSTRUCTION - Premium rubber exterior guarantees long-lasting durability and water-tight sealing.
COMPRESSION THREAD COMPATIBILITY - Seamlessly integrates with standard compression inlet and outlet connections for easy installation.
PACK OF 5 FOR ULTIMATE CONVENIENCE - Never run out—keep spares handy for quick, hassle-free replacements.

The Thunderfix Diaphragm Washer pack includes five high-quality rubber washers designed for 32mm/1¼" cistern float valves. Featuring compression thread compatibility and durable construction, these washers ensure reliable, leak-free operation and easy installation, meeting UK and EU plumbing standards.

Specifications

ASIN	B00YJEW5QU
Best Sellers Rank	22,627 in DIY & Tools ( See Top 100 in DIY & Tools ) 24 in Tap & Valve Washers
Brand	Thunderfix
Connector Type	Compression
Customer Reviews	4.5 4.5 out of 5 stars (927)
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

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Rp233479

Duties & taxes included

In stock

Sold byAmazon IndonesiaDelivered 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 Indonesia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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