- +61 (08) 8187 2888
- sales@saxonengineering.com.au
- 23 Heath St, Lonsdale, SA 5160
RPZ Backflow Cages
Secure, Compliant Protection
At Saxon Engineering, we design and manufacture heavy-duty RPZ backflow cages to protect reduced pressure zone (RPZ) backflow prevention devices from vandalism, accidental damage, and unauthorised access. Proudly Australian-made in South Australia, our RPZ cages are built for durability, safe access, and practical compliance across commercial, industrial, and public environments. RPZ backflow devices are critical components in water supply systems and are commonly installed in accessible outdoor or plant areas. A properly designed steel RPZ backflow cage helps protect this essential infrastructure while maintaining the clearances and access required for inspection, testing, and ongoing maintenance.
Why RPZ Backflow Cages Are Important
RPZ backflow prevention devices play a vital role in protecting potable water supplies. When these units are damaged or tampered with, it can result in service disruption, costly repairs, and compliance issues.
Installing a purpose-built RPZ backflow cage helps to:
Protect critical water infrastructure
Reduce the risk of vandalism or unauthorised interference
Improve site safety by restricting access to mechanical services
Protect valves, pipework, and test points
Support authority, council, and asset-owner requirements
Our RPZ cages are designed to provide physical protection without restricting authorised access, ensuring testing and servicing can be carried out safely and efficiently.
Designed for Commercial & Public Environments
Saxon Engineering’s RPZ backflow cages are commonly supplied for:
Commercial buildings and offices
Shopping centres and retail developments
Schools, universities, and childcare centres
Hospitals and healthcare facilities
Industrial sites and warehouses
Councils, utilities, and government facilities
Apartment complexes and strata properties
These environments often require solutions that balance security, durability, and accessibility, which is exactly what our RPZ cages are designed to deliver.
Heavy-Duty Steel Construction
Our RPZ backflow cages are fabricated using robust galvanised steel construction developed through extensive experience in custom plant and security enclosures.
Typical construction features:
Galvanised steel framing using SHS or equal angle sections
Welded galvanised steel mesh infill to all sides and top
Smooth-finished welds and removal of sharp edges for safety
Open mesh design to allow visibility and ventilation
Built for long-term outdoor exposure
Framing sizes and mesh apertures are selected to suit the project specification and authority requirements, providing strength while maintaining airflow and inspection visibility.
Custom RPZ Backflow Cages to Suit Your Site
No two RPZ installations are the same. Pipe layouts, valve orientations, test points, and authority requirements vary significantly between sites. For this reason, Saxon Engineering specialises in custom RPZ backflow cages.
Our cages can be designed to accommodate:
Single or multiple RPZ assemblies
Ground-mounted or wall-mounted installations
Vertical or horizontal pipework configurations
Required clearances for testing and maintenance
Integration with existing services or structures
A range of standard sizes may be suitable for common installations, with custom fabrication available where site conditions require it.
Access, Clearance & Serviceability
Access for licensed testers and maintenance personnel is a key consideration in every RPZ cage design. Our cages are configured to allow:
Clear access to valves and test points
Visibility of the RPZ assembly for inspection
Practical working space within the enclosure
Secure restriction of unauthorised access
Access is typically provided via hinged, padlockable lids or access panels, allowing authorised personnel to safely carry out testing and servicing.
Cages are generally supplied with an open-bottom design, allowing clearance for pipework, drainage, and installation over existing services without obstructing ground conditions.
Finishes to Suit the Environment
RPZ backflow cages are available in a range of finishes to suit exposure conditions and project specifications, including:
Pre-galvanised steel for sheltered or lower-corrosion environments
Hot-dip galvanised steel for exposed or high-corrosion locations
Stainless steel for highly corrosive or specialist applications
Powder-coated finishes for architectural or visually sensitive sites
Finish selection is confirmed based on site location, environmental exposure, and authority requirements.
Flat-Pack & Efficient Supply
Where practical, RPZ backflow cages are supplied flat-packed, with interlocking panels and bolted assembly to reduce freight costs and simplify transport. This approach is particularly beneficial for interstate or regional projects while maintaining structural integrity and security once assembled.
Based in South Australia, Saxon Engineering supplies RPZ backflow cages Australia-wide, with delivery arranged to suit project requirements.
Standard Stock Sizes
Available Surface Mounted (flanges) or In-Ground (400mm legs)
25mm Mesh
| Itemcode | Width (mm) | Height (mm) | Depth (mm) |
|---|---|---|---|
| 090906/25 | 900 | 900 | 600 |
| 100906/25 | 1000 | 900 | 600 |
| 121006/25 | 1200 | 1000 | 600 |
| 121206/25 | 1200 | 1200 | 600 |
| 121406/25 | 1200 | 1400 | 600 |
| 121606/25 | 1200 | 1600 | 600 |
| 121806/25 | 1200 | 1800 | 600 |
Why Choose Saxon Engineering?
Australian-made RPZ backflow cages
Manufactured in South Australia
Heavy-duty galvanised steel construction
Custom designs to suit site-specific installations
Padlockable access and open-bottom designs
Finishes to suit authority and environmental requirements
Trusted by councils, utilities, and facility managers
Technical Specifications
The following outlines typical design and construction features. Final specifications are confirmed prior to fabrication to suit project and authority requirements.
Construction
Galvanised steel framing (SHS or equal angle sections)
Welded galvanised steel mesh infill to sides and top
Smooth-finished welds and removal of sharp edges
Mesh Options
Typical mesh sizes include 50 × 50 or 25 × 25 weldmesh
Mesh selection to suit security, airflow, and authority requirements
Access & Security
Hinged lids or access panels
Provision for padlocking
Designed for authorised testing and maintenance access
Base Configuration
Open-bottom design for pipework clearance and drainage
Fixing & Mounting
Designed for fixing to concrete or structural substrates
Fixed using M10 chemical or mechanical anchors
Fixing method confirmed to suit installation substrate
Finish
Pre-galvanised steel
Hot-dip galvanised steel (optional)
Stainless steel (optional)
Powder-coated finish (optional)
Zinc touch-up recommended to apply where site welding is required
Design & Supply
Supplied flat-packed where practical
Modular panel construction for efficient transport
Australia-wide delivery available
SMALL RPZ SPec
MEDIUM RPZ Spec
LARGE RPZ Spec
(SA Water Size – not SA Water spec)
SA Water SPEC
FAQ
What is an RPZ backflow cage used for?
An RPZ backflow cage is used to protect reduced pressure zone (RPZ) backflow prevention devices from vandalism, accidental damage, and unauthorised access while maintaining the access and clearances required for testing, inspection, and maintenance.
Do RPZ backflow cages restrict access for testing and maintenance?
No. Our RPZ cages are specifically designed to allow clear and practical access for authorised testers and maintenance personnel. Hinged, padlockable lids or access panels are incorporated to ensure testing and servicing can be carried out safely without removing the enclosure.
Do RPZ cages meet council or water authority requirements?
RPZ backflow cages can be designed and fabricated to align with council, water authority, or project-specific requirements, provided those requirements are nominated at the time of enquiry or order. Final compliance depends on the applicable specification, which is reviewed and confirmed prior to fabrication.
Do RPZ backflow cages have a base or floor?
No. RPZ cages are typically supplied with an open-bottom design, allowing clearance for pipework, drainage, and installation over existing services without trapping water or debris.
How are RPZ backflow cages fixed in place?
RPZ cages are designed to be fixed to concrete slabs or structural substrates using mechanical or chemical anchors. The fixing method and base plate details are confirmed based on the installation substrate and project requirements.
What information is needed to quote an RPZ backflow cage?
To provide an accurate quotation, we typically require:
RPZ device size and configuration
Pipework layout and valve orientation
Approximate overall dimensions
Preferred material and finish
Installation substrate (e.g. concrete slab)
Delivery location
If full details are not yet available, we can assist in defining the scope.
What finishes are available and which should I choose?
Saxon Engineering offers a range of finishes for RPZ backflow cages to suit different environments, durability requirements, and aesthetic preferences. The most suitable option depends on the site location, exposure conditions, and any applicable project or authority specifications.
Pre-galvanised steel
Best suited for:
Sheltered or semi-sheltered locations
Standard commercial and residential installations
Lower-corrosion environments
Cost-effective projects
Pre-galvanised RPZ cages provide reliable corrosion protection for many typical installations where exposure to salt air or harsh conditions is limited.
Hot-dip galvanised steel
Best suited for:
Outdoor and fully exposed installations
Coastal or high-corrosion environments
Industrial sites
Government, education, and infrastructure projects
Hot-dip galvanising provides a thicker, more durable zinc coating and is recommended where long service life and minimal maintenance are required. Where any site welding is necessary, appropriate zinc-rich touch-up protection is recommended.
Stainless steel
Best suited for:
Highly corrosive environments
Food processing, healthcare, or specialist facilities
Architecturally sensitive sites requiring a premium finish
Locations where long-term durability and appearance are critical
Stainless steel RPZ cages offer excellent corrosion resistance and a clean, high-quality finish, making them ideal for demanding or specialist environments.
Powder coated finishes
Best suited for:
Architecturally sensitive locations
Commercial or public-facing sites
Projects requiring colour matching or visual integration
Powder coating can be applied over suitable base materials to achieve a specific colour or aesthetic outcome. This option is often selected where the RPZ cage needs to blend with surrounding buildings or meet architectural design requirements.
If you’re unsure which finish is best for your project, our team can recommend the most appropriate option based on the site location, exposure conditions, and intended application.
Can you deliver to Me?
Based in South Australia, Saxon Engineering supplies Backflow RPZ Cages Australia-wide, working with builders, mechanical contractors, facility managers, and government clients on projects of all sizes. Where practical, RPZ backflow cages will be supplied flat-packed, with interlocking panels and bolted assembly. This helps reduce freight costs and simplifies transport, particularly for interstate or regional projects.
Is there anywhere I can see them in person?
We have multiple sizes on display at our facility located at:
23 Heath Street, Lonsdale SA 5160
As this is a working factory site, inspections are available by appointment only. Please call ahead to ensure safe access, and all visitors must wear enclosed shoes when attending.