Description
The Fluidmaster PRO400UK is the professional plumber’s standard 1/2" bottom entry fill valve — trusted across the UK for its ultra-quiet operation, fast refill, and dependable long-life performance. Height adjustable from 230mm to 355mm, it fits the majority of standard toilet cisterns straight out of the box. An anti-siphon design protects the water supply from contamination, and the valve meets all relevant UK water fittings regulations.
⚠️ Bottom Entry: This is a bottom entry fill valve — the water supply connects from underneath the cistern. If your supply enters from the side, you need a side-entry valve instead. Please check your cistern configuration before ordering.
Key Features
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Height adjustable 230–355mm — fits the majority of standard UK cisterns
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Ultra-quiet operation — minimal noise and water hammer
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Fast refill — efficient water delivery for quick turnaround between flushes
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Anti-siphon design — prevents backflow and protects the drinking water supply
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1/2" BSP bottom entry connection — standard UK cistern fitting
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Professional grade — preferred by plumbers for reliability and longevity
- Complies with Water Supply (Water Fittings) Regulations
Technical Specification
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Brand: Fluidmaster
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Model: PRO400UK
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SKU: K07075
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Connection type: Bottom entry
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Connection size: 1/2" BSP
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Height range: 230–355mm (adjustable)
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Anti-siphon: Yes
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Compliance: Meets UK Water Supply (Water Fittings) Regulations
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Weight: 0.5 kg
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Country of Origin: Spain
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Barcode: 0039961994028
Delivery Information
This is a small, postable item covered by a one-off small item delivery charge. You can combine it with other small items in a single order and pay just one delivery charge. Browse all items covered by the small delivery charge.
Other Fluidmaster Products
Frequently Asked Questions
What’s the difference between the PRO400UK and PRO45B?
Both are 1/2" bottom entry fill valves, but the PRO45B features a heavy-duty brass shank for superior durability, corrosion resistance, and longevity — making it the preferred choice for demanding or commercial installations. The PRO400UK is the standard professional-grade option suitable for most residential and commercial applications.
Will this fit my cistern?
The PRO400UK adjusts from 230mm to 355mm in height, covering the majority of standard UK toilet cisterns. Confirm your cistern has a 1/2" bottom-entry water supply connection before ordering. If you’re unsure, contact us with your cistern model.
What is anti-siphon protection?
The anti-siphon design prevents water from being drawn back from the cistern into the main water supply — an important hygiene and regulatory requirement under UK Water Supply (Water Fittings) Regulations.
How quickly will my order be dispatched?
If the item shows as in stock, it will be dispatched within 48 hours. If the item is showing as 0 stock, it is ordered in specially for you and will typically be dispatched within 4 working days.
Can I order if the item shows as out of stock?
Yes — you can still place an order and we’ll source it for you. Contact us at customerservice@bubblegumbathrooms.co.uk or call 01603 381095 if you need a lead time estimate.
Is delivery free?
This is a small postable item with a one-off small item delivery charge. You can combine multiple small items in one order and pay a single charge.
