Toilet Flush Valve Washer – Replacement Seal for Concealed Cistern

How to Fix a Toilet That Keeps Running

If your toilet keeps running or water is leaking into the bowl, a worn flush valve washer is often the cause.

This toilet flush valve washer helps create a tight seal inside your concealed cistern, restoring proper flushing and preventing water waste.

Key Features

• Stops leaking toilets and constant running water
• Durable rubber for long-lasting sealing performance
• Easy DIY replacement – no plumber required
• Designed for selected concealed cistern flush valves

Compatibility Guide (Important)

This washer is NOT universal and only fits selected concealed cistern flush valves.

Product images include a reference flush valve to help identify compatibility. However, similar valves may look alike.

👉 Please match your existing valve with the reference image AND confirm the washer size before purchase.

Size matching is the most important factor.

If unsure, feel free to contact us with a photo of your valve.

Common Problems This Fixes

• Toilet keeps running
• Water leaking into the bowl
• Weak or incomplete flush
• Worn or damaged flush valve seal

Frequently Asked Questions

Q1
Is this washer universal?
A: No, it only fits selected flush valves. Please check images and size before purchase.

Q2
Will this fix a leaking toilet?
A: Yes, if the size matches your existing washer, it will stop leaks effectively.

Q3
Can I rely on the valve image for compatibility?
A: The image helps identify similar valve types, but size confirmation is essential.

Q4
Do I need a plumber?
A: If the flush valve removed from cistern, then this is a simple DIY replacement.

Specifications:

• Overall diameter: 53 mm
• Centre hole diameter: 16.5 mm
• Thickness: 3 mm

This flush valve rubber gasket / cistern rubber washer replacement is easy to install and suitable for DIY users. As the measurements are taken manually, a slight variation of approximately 0.5–1 mm may occur.

Please measure your existing rubber washer before purchasing this Concealed Cistern Flush Valve Rubber Washer  to avoid buying the wrong item.