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 tech

🧴Durable rubber seal

🛠️Precision 32mm/1¼" fit

COP 48166

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚿 Seal the deal with Thunderfix precision!

TRUSTED BY THOUSANDS - Backed by 928+ reviews and a 4.5-star rating, join the community of savvy DIY pros upgrading their cisterns.
PERFECT FIT EVERY TIME - Specifically engineered for 32mm/1¼" cistern float valves ensuring leak-proof performance.
PREMIUM RUBBER DURABILITY - Crafted from high-quality rubber to resist wear, tear, and water damage over time.
PACK OF 5 FOR ULTIMATE VALUE - Keep your plumbing game strong with a reliable multi-pack—never run out during critical repairs.
COMPRESSION THREAD COMPATIBILITY - Seamlessly connects with standard compression fittings for easy, tool-free installation.

The Thunderfix Diaphragm Washer pack includes five robust rubber washers designed for 32mm/1¼" cistern float valves. Featuring compression thread compatibility and crafted to meet UK and EU standards, these washers ensure a secure, leak-free connection. Highly rated by nearly a thousand users, this pack is a must-have for professional-grade plumbing maintenance and upgrades.

Specifications

ASIN	B00YJEW5QU
Best Sellers Rank	29,187 in DIY & Tools ( See Top 100 in DIY & Tools ) 29 in Tap & Valve Washers
Brand	Thunderfix
Connector Type	Compression
Customer Reviews	4.5 out of 5 stars 928 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

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