---
title: What Every Installer Must Know About Cat 5 Backflow Prevention
description: Learn about Cat 5 backflow prevention for installers, including compliance, WRAS-approved products, suitable devices, and the importance of maintenance.
image: https://d37oebn0w9ir6a.cloudfront.net/account_50126/what-every-installer-needs-to-know-about-cat-5-backflow-prevention_c5c9a9185a122691526fc4528b6ee2ef.png
---
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# What Every Installer Needs To Know About Cat 5 Backflow Prevention
Cat 5 backflow prevention refers to safeguarding potable water supplies from contamination caused by fluids classified as Category 5 (highly hazardous). **Fluid Category 5** is present in almost every water system and it is also the liquid that is likely to cause the most legislative headaches. Fortunately, investing in a [water tank](https://enduramaxx.co.uk/tanks/enduramaxx-water-tanks/) that complies with Cat 5 break tank regulations, along with WRAS-approved fixtures for installation, significantly reduces the concerns for installers. Here’s everything you need to know.
[](https://hubspot-cta-redirect-eu1-prod.s3.amazonaws.com/cta/redirect/4345152/fe718d5f-5d27-45a0-8eb2-1edd5679d141)
## **What Is Cat 5 Backflow Prevention?**
Backflow is a reversal of the normal direction of a liquid, and usually caused by a [pressure problem](https://enduramaxx.co.uk/tanks/enduramaxx-water-tanks/) or ruptured vacuum. Backflow is always a nuisance, but if you’re dealing with Category 5 liquids, it is a new level of dangerous. Fluid Category 5 is [defined](https://www.managedwaterservices.co.uk/wp-content/uploads/2022/09/what-are-water-fluid-categories-toolbox-talk-february-2022.pdf) by the Water Management Society as liquids that pose a serious health hazard. The categories include liquids that contain pathogens, are radioactive, or are otherwise toxic.
## **How Important Is Compliance?**
Compliance is a legal requirement. The overarching pieces of legislation are the [Water Industry Act 1991](https://www.legislation.gov.uk/ukpga/1991/56/contents), the [Water Supply (Water Fittings) Regulations 1999](https://www.legislation.gov.uk/uksi/1999/1148/schedule/1/paragraph/1n5/made), and the [Scottish Water Byelaws](https://www.scottishwater.co.uk/business-and-developers/byelaws-and-trade-effluent/water-byelaws). Fluid tanks are covered by various British Standards. One-piece tanks and sectional tanks must ascribe to [BS EN 13280:2001](https://knowledge.bsigroup.com/products/specification-for-glass-fibre-reinforced-cisterns-of-one-piece-and-sectional-construction-for-the-storage-above-ground-of-cold-water?version=standard). Cat 5 backflow prevention is covered by [BS EN 12729:2023](https://knowledge.bsigroup.com/products/devices-to-prevent-pollution-by-backflow-of-potable-water-controllable-backflow-preventer-with-reduced-pressure-zone-family-b-type-a-1?version=tracked). These laws together legalise compulsory notification and approval of all fittings, as well as adherence to backflow prevention requirements. Non-compliance can and does result in fines, criminal charges, and mandatory corrective actions.
## **What Are WRAS Approved Products?**
The Water Regulations Advisory Scheme ([WRAS](https://www.wrasapprovals.co.uk/)) determines whether a product complies with the Water Supply (Water Fittings) Regulations and Scottish Byelaws. WRAS has three main points of focus in its Cat 5 break tank regulations. The first is water quality and safety, which is ensured with extensive testing. The second is regulatory compliance, effectively assuming accountability on behalf of manufacturers. Finally, [WRAS products](https://blog.enduramaxx.co.uk/news/what-are-the-different-types-of-water-tanks) ensure stakeholder and consumer peace of mind. When dealing with Category 5 Fluids, all three elements are essential.
## **What Are Appropriate Backflow Prevention Devices?**
There are three authorised backflow prevention [device](https://www.keraflo.co.uk/wp-content/uploads/2018/12/Keraflo-Guide-to-the-UK-Water-Supply-Regulations.pdf)[classifications](https://www.keraflo.co.uk/wp-content/uploads/2018/12/Keraflo-Guide-to-the-UK-Water-Supply-Regulations.pdf). The first is AA. This Cat 5 break tank regulation is an air gap with an unrestricted discharge spill over level. The second is AB. This is an air gap with a weir overflow. Finally – and less commonly – is AD. This is an air gap with an injector. All three have the purpose of creating a physical separation between the water supply and the Fluid Category 5. If there is a gap, there can be no backflow.
## **Why Is Regular Inspection And Maintenance So Important?**
Water and fluids are difficult substances to [safely and effectively manage](https://blog.enduramaxx.co.uk/underground-water-tank-safety). If there is an opportunity for a leak or a backflow, it is almost a guarantee that your [Cat 5 fluid](https://blog.enduramaxx.co.uk/news/bespoke-custom-made-water-tank)will find it. Factors that can make the problem worse are faulty valves and seals, which can alter the pressure and eliminate the precious air gap. Consequently, most systems have dual safety systems in place, as well as downstream check valves. However, these need to be regularly inspected and maintained to ensure that they are doing their job properly.
## **What Next?**
Don’t take chances with your water system installations—rely on Enduramaxx for WRAS-approved products and expert guidance on Category 5 backflow prevention. [Request](https://enduramaxx.co.uk/request-quote/)[a quote](https://enduramaxx.co.uk/request-quote/) from our team today!
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- [Vertical Storage Tanks (55)](https://blog.enduramaxx.co.uk/tag/vertical-storage-tanks)
- [Rainwater Harvesting Tanks (46)](https://blog.enduramaxx.co.uk/tag/rainwater-harvesting-tanks)
- [Vertical Rainwater Tanks (38)](https://blog.enduramaxx.co.uk/tag/vertical-rainwater-tanks)
- [Cone Bottom Tanks (29)](https://blog.enduramaxx.co.uk/tag/cone-bottom-tanks)
- [Conical Cone Tanks (27)](https://blog.enduramaxx.co.uk/tag/conical-cone-tanks)
- [Rainwater Harvesting (17)](https://blog.enduramaxx.co.uk/tag/rainwater-harvesting)
- [Water Bowsers (15)](https://blog.enduramaxx.co.uk/tag/water-bowsers)
- [Horizontal Tanks (14)](https://blog.enduramaxx.co.uk/tag/horizontal-tanks)
- [Potable Water Tanks (13)](https://blog.enduramaxx.co.uk/tag/potable-water-tanks)
- [Case Studies (9)](https://blog.enduramaxx.co.uk/tag/case-studies)
- [Farming (9)](https://blog.enduramaxx.co.uk/tag/farming)
- [Industrial Storage Tanks (8)](https://blog.enduramaxx.co.uk/tag/industrial-storage-tanks)
- [Horizontal Transport Tanks (6)](https://blog.enduramaxx.co.uk/tag/horizontal-transport-tanks)
- [Liquid Fertilser Storage Tanks (6)](https://blog.enduramaxx.co.uk/tag/liquid-fertilser-storage-tanks)
- [Microbrewery (6)](https://blog.enduramaxx.co.uk/tag/microbrewery)
- [Mixer Tanks (6)](https://blog.enduramaxx.co.uk/tag/mixer-tanks)
- [Rainwater (6)](https://blog.enduramaxx.co.uk/tag/rainwater)
- [WRAS Approved Potable Tanks (6)](https://blog.enduramaxx.co.uk/tag/wras-approved-potable-tanks)
- [Wine and Beer Production (6)](https://blog.enduramaxx.co.uk/tag/wine-and-beer-production)
- [Cider Production (5)](https://blog.enduramaxx.co.uk/tag/cider-production)
- [Category 5 Break Tanks (4)](https://blog.enduramaxx.co.uk/tag/category-5-break-tanks)
- [Fertiliser Tanks (4)](https://blog.enduramaxx.co.uk/tag/fertiliser-tanks)
- [Molasses Tanks (4)](https://blog.enduramaxx.co.uk/tag/molasses-tanks)
- [Polyethylene tanks (4)](https://blog.enduramaxx.co.uk/tag/polyethylene-tanks)
- [Rainwater Filter Kits (4)](https://blog.enduramaxx.co.uk/tag/rainwater-filter-kits)
- [SPECIALIST & BESPOKE TANKS (4)](https://blog.enduramaxx.co.uk/tag/specialist-bespoke-tanks)
- [Slimline Tanks (4)](https://blog.enduramaxx.co.uk/tag/slimline-tanks)
- [WRAS Approved (4)](https://blog.enduramaxx.co.uk/tag/wras-approved)
- [Bunded Tanks (3)](https://blog.enduramaxx.co.uk/tag/bunded-tanks)
- [Clarification Tanks (2)](https://blog.enduramaxx.co.uk/tag/clarification-tanks)
- [Closed Top Bunded Tanks (2)](https://blog.enduramaxx.co.uk/tag/closed-top-bunded-tanks)
- [Crosslinked Polymer Tanks (XLPE) (2)](https://blog.enduramaxx.co.uk/tag/crosslinked-polymer-tanks-xlpe)
- [Open Top Cone Tanks (2)](https://blog.enduramaxx.co.uk/tag/open-top-cone-tanks)
- [Pro Series Spot Sprayers (2)](https://blog.enduramaxx.co.uk/tag/pro-series-spot-sprayers)
- [Sump Tanks (2)](https://blog.enduramaxx.co.uk/tag/sump-tanks)
- [Tank Installation (2)](https://blog.enduramaxx.co.uk/tag/tank-installation)
- [Water Butt (2)](https://blog.enduramaxx.co.uk/tag/water-butt)
- [underground water tanks (2)](https://blog.enduramaxx.co.uk/tag/underground-water-tanks)
- [ACCESSORIES & FITTINGS (1)](https://blog.enduramaxx.co.uk/tag/accessories-fittings)
- [ATV & UTV SPRAYING UNITS (1)](https://blog.enduramaxx.co.uk/tag/atv-utv-spraying-units)
- [Above Ground Effluent Tanks (1)](https://blog.enduramaxx.co.uk/tag/above-ground-effluent-tanks)
- [Baffled Slimline Tanks (1)](https://blog.enduramaxx.co.uk/tag/baffled-slimline-tanks)
- [Bespoke Tank Frames (1)](https://blog.enduramaxx.co.uk/tag/bespoke-tank-frames)
- [Category 5 Turret (1)](https://blog.enduramaxx.co.uk/tag/category-5-turret)
- [Caustic Soda Tanks (1)](https://blog.enduramaxx.co.uk/tag/caustic-soda-tanks)
- [Craft beer (1)](https://blog.enduramaxx.co.uk/tag/craft-beer)
- [Effluent Tanks (1)](https://blog.enduramaxx.co.uk/tag/effluent-tanks)
- [Enduramaxx (1)](https://blog.enduramaxx.co.uk/tag/enduramaxx)
- [Ferric Chloride Tanks (1)](https://blog.enduramaxx.co.uk/tag/ferric-chloride-tanks)
- [Fire Safety Regulations (1)](https://blog.enduramaxx.co.uk/tag/fire-safety-regulations)
- [Fire Sprinkler Water Storage Tanks (1)](https://blog.enduramaxx.co.uk/tag/fire-sprinkler-water-storage-tanks)
- [Industrial Water Tank (1)](https://blog.enduramaxx.co.uk/tag/industrial-water-tank)
- [Insulated Tanks (1)](https://blog.enduramaxx.co.uk/tag/insulated-tanks)
- [Open Top Bunded Tanks (1)](https://blog.enduramaxx.co.uk/tag/open-top-bunded-tanks)
- [Open Top Vertical Tanks (1)](https://blog.enduramaxx.co.uk/tag/open-top-vertical-tanks)
- [Polyethylene Potable Water Tanks (1)](https://blog.enduramaxx.co.uk/tag/polyethylene-potable-water-tanks)
- [Polyvinylidene Fluoride (PVDF) Tanks (1)](https://blog.enduramaxx.co.uk/tag/polyvinylidene-fluoride-pvdf-tanks)
- [Polyvinylidene Fluoride Tanks (PVDF) (1)](https://blog.enduramaxx.co.uk/tag/polyvinylidene-fluoride-tanks-pvdf)
- [Pressure Washers (1)](https://blog.enduramaxx.co.uk/tag/pressure-washers)
- [RWH (1)](https://blog.enduramaxx.co.uk/tag/rwh)
- [Sodium Hydroxide Storage Tanks (1)](https://blog.enduramaxx.co.uk/tag/sodium-hydroxide-storage-tanks)
- [Sprayer Fill-up Tanks (1)](https://blog.enduramaxx.co.uk/tag/sprayer-fill-up-tanks)
- [Uncategorised (1)](https://blog.enduramaxx.co.uk/tag/uncategorised)
- [Water Transport Tanks (1)](https://blog.enduramaxx.co.uk/tag/water-transport-tanks)
- [liquid fertiliser tank (1)](https://blog.enduramaxx.co.uk/tag/liquid-fertiliser-tank)
see all
### Featured products
[2,500 Litre Underground Tank](https://enduramaxx.co.uk/enduramaxx/2500-litre-underground-water-tank/)
[10,000 Litre Rainwater Tank](https://enduramaxx.co.uk/enduramaxx/10000-litre-rainwater-harvesting-tank/)
[Filter Kit B – rainwater harvesting](https://enduramaxx.co.uk/enduramaxx/rainwater-harvesting-kit-b/)
[1,000 Litre Slimline Potable Drinking Water Tank, 2 Lids](https://enduramaxx.co.uk/enduramaxx/1000-litre-water-tank-slimline-wras-approved-2-lids/)
[4,000 Litre Potable Drinking Water Tank](https://enduramaxx.co.uk/enduramaxx/4000-litre-wras-approved-potable-water-tank/)
### Sign up to the newsletter
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[05th June 2024](https://blog.enduramaxx.co.uk/archive/2024/06/05) / by [enduramaxx.marketing](https://blog.enduramaxx.co.uk/author/enduramaxx-marketing) / in [Category 5 Break Tanks](https://blog.enduramaxx.co.uk/tag/category-5-break-tanks)
**Tags:** [Category 5 Break Tanks](https://blog.enduramaxx.co.uk/tag/category-5-break-tanks)
\>
### enduramaxx.marketing
### Related Posts
[Blog](https://blog.enduramaxx.co.uk/tag/blog)
## [What Is a Cat 5 Break Tank? | Understanding Backflow Protection](https://blog.enduramaxx.co.uk/news/what-is-a-cat-5-break-tank)
A Cat 5 break tank is a water tank featuring an air gap between the inlet and outlet to ensure that...
[11th May 2021](https://blog.enduramaxx.co.uk/archive/2021/05/11) by [enduramaxx.marketing](https://blog.enduramaxx.co.uk/author/enduramaxx-marketing)
## [Water Storage And Its Uses In Construction](https://blog.enduramaxx.co.uk/water-storage-and-its-uses-in-construction)
Water storage is a key component of any construction site. A water tank may be used for drinking,...
[25th June 2021](https://blog.enduramaxx.co.uk/archive/2021/06/25) by [enduramaxx.marketing](https://blog.enduramaxx.co.uk/author/enduramaxx-marketing)
[Mixer Tanks](https://blog.enduramaxx.co.uk/tag/mixer-tanks), [Chemical Storage Tanks](https://blog.enduramaxx.co.uk/tag/chemical-storage-tanks), [Vertical Storage Tanks](https://blog.enduramaxx.co.uk/tag/vertical-storage-tanks), [Blog](https://blog.enduramaxx.co.uk/tag/blog), [Chemical Tanks](https://blog.enduramaxx.co.uk/tag/chemical-tanks), [Chemical Dosing Tanks](https://blog.enduramaxx.co.uk/tag/chemical-dosing-tanks)
## [Do I Need A CAT5 Break Tank For An Irrigation System?](https://blog.enduramaxx.co.uk/news/do-i-need-a-cat5-break-tank-for-an-irrigation-system)
A CAT5 Break Tank for an irrigation system is used to provide an air gap between the mains supply...
[11th May 2021](https://blog.enduramaxx.co.uk/archive/2021/05/11) by [enduramaxx.marketing](https://blog.enduramaxx.co.uk/author/enduramaxx-marketing)
[Previous Maximising Efficiency Of Clarification Tanks In Wastewater Treatment](https://blog.enduramaxx.co.uk/clarification-tanks-efficiency-in-wastewater-treatment)
[Next Slimline Water Tanks: A Versatile Option For Industrial Applications](https://blog.enduramaxx.co.uk/versatility-of-slimline-water-tanks)
### Related Products
[](https://enduramaxx.co.uk/enduramaxx/2500-litre-underground-water-tank/)
#### [2,500 Litre Underground Tank](https://enduramaxx.co.uk/enduramaxx/2500-litre-underground-water-tank/)
From £1,080.00 inc. VAT
£900.00 exc. VAT
[](https://enduramaxx.co.uk/enduramaxx/10000-litre-rainwater-harvesting-tank/)
#### [10,000 Litre Rainwater Tank](https://enduramaxx.co.uk/enduramaxx/10000-litre-rainwater-harvesting-tank/)
From £1,344.00 inc. VAT
£1,120.00 exc. VAT
[](https://enduramaxx.co.uk/enduramaxx/4000-litre-wras-approved-potable-water-tank/)
#### [4,000 Litre Potable Drinking Water Tank](https://enduramaxx.co.uk/enduramaxx/4000-litre-wras-approved-potable-water-tank/)
From £768.00 inc. VAT
£640.00 exc. VAT
[](https://enduramaxx.co.uk/enduramaxx/rainwater-harvesting-kit-b/)
#### [Filter Kit B – rainwater harvesting](https://enduramaxx.co.uk/enduramaxx/rainwater-harvesting-kit-b/)
£480.00 inc. VAT
£400.00 exc. VAT
###### [LATEST NEWS](https://blog.enduramaxx.co.uk/)
### Read our latest blogs!
###### INFORMATION
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###### CONTACT US
### [01778 562810](tel:01778%20562810)
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**Enduramaxx Limited**
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