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EziPit
The Iplex EziPit® range, featuring the EziPit® 425 Sewer Maintenance Shaft, EziPit® 600 Sewer Maintenance Chamber and the EziPit® 1000 Sewer Maintenance Hole, offers benefits and flexibility in design and installation for modern sewer networks.
The environmental, technical and economical demands of water authorities for a water-tight, corrosion resistant, stable and durable sewer system are now a reality with Iplex EziPit® systems. Discover simplified installation and maintenance with the EziPit.
Contact us today to discuss how the EziPit® sewer pit range will benefit your next sewer maintenance project.
Applications
Applications
The EziPit® is a polypropylene inspection and maintenance structure (Maintenance Shaft, Maintenance Chamber or Maintenance Hole) designed for buried gravity sewer applications. This easy-to-install sewer pit system complements our plastic pipeline systems and is designed with practical inspection shafts and maintenance holes for easy surveying and upkeep.
An EziPit sewer pit inspection system consists of a base, a single wall corrugated riser, a reducing cone for maintenance holes and a range of covers designed for trafficable and non-trafficable areas. This design allows a safe sewer access point from the surface.
Sewer Access Shafts, Chambers and Maintenance Holes are used (where practicable) at every:
- Change of alignment
- Junction
- Change in the size of a sewer
In addition, the sewer pits are used at specified intervals for inspection and maintenance. National Sewer Standards and Codes specify requirements for the location and spacing of Inspection Shafts and Sewer Access Chambers.
Contact us today to find out more about how sewer pits and related systems from the EziPit range will benefit your next sewer maintenance project.
EziPit Sewer Maintenance Structures
The EziPit is a lightweight, modular structure made of polypropylene which provides years of corrosion free service, and potential savings on maintenance costs. Made from polypropylene, the EziPit delivers simple installation, excellent in-ground performance, and lower operational costs.
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Download the EziPit Installation Guide and Technical Specifications
Advantages
Polypropylene offers several advantages in gravity sewer pits, including excellent resistance to sulphuric acid corrosion, low weight, and high stiffness. These properties create a lightweight yet durable structure that withstands long term exposure to hydrogen sulphide gas commonly found in sewer environments.
The overall benefits of the EziPit® system include:
| Features | Benefits |
| Flexibility | The base includes adjustable pipe sockets which allow the pipe grade or angle to be adjusted up to 7.5o in any direction in the trench. |
| Long Service Life | Polypropylene base and riser for chemical resistance in sewer environments. |
| Robust & Flexible Riser | Flexible corrugated sewer riser accommodates ground movement and dynamic traffic loads without cracking or breaking. The riser is easily cut on-site for height adjustment. |
| In-ground Performance | Fully resistant to external loads up to a depth of 6 metres and water tight up to 5 metres. |
| Ease of Installation | Light-weight modular components for ease of handling in deep trenching. |
| Safety Performance | Can be assembled and backfilled at the same time as the sewer pipe, reducing costs in plant, labour and the risks associated with open excavation. |
| Resistance to Acid Attack | Its polypropylene construction makes the EziPit resistant to acid attack, which can be common in gravity and septic sewer maintenance systems |
Polypropylene Sewer Maintenance Structures - EziPit’s Advantages
Corrosion Resistance
- PP is resistant to chemical attack, in sewer environments.
- Polypropylene is impervious to hydrogen sulphide gas and the resulting sulphuric acid that forms in wet sewer conditions. This eliminates acid corrosion and ensures the long-term structural integrity of the EziPit.
- Lowers maintenance cost and frequency.
EziPit Ensures Your Sewer Maintenance System Remains Ingress Free
- The EziPit system is constructed with water-tight, sealed connections, resisting infiltration of groundwater and tree roots.
EziPit PP Sewer Maintenance Shafts Are Lightweight and Easy to Install
- Being lightweight and modular, PP components can be easily handled, transported and installed without the need for heavy lifting equipment.
- This reduces installation costs and avoids OH&S risks associated with deep trenching and manual handling.
- Concrete sewer maintenance structures are extremely heavy, requiring specialised lifting machinery, which can result in longer installation times.
EziPit Sewer Maintenance Systems Offer Resilience Against Ground Movement
- The flexibility of polypropylene makes the sewer pit structure less susceptible to joint separation and damage with ground movement, vibration and seismic activity.
Overall Longer Service Life and Lower Lifecycle Cost
- The corrosion resistant nature of PP increases service life and decreases maintenance costs.
- The high chemical resistance and structural stability of PP can translate to a long service life and lower maintenance requirements.
Material Options
Material Options
| Polypropylene Property | Value & Unit |
| Density of Pipe Compound | 900 kg/m³ |
| EziPit® 425 Riser - Ring Bending Stiffness | 4000 N/m/m |
| EziPit® 600 Riser - Ring Bending Stiffness | 8000 N/m/m |
| EziPit® 1000 Riser - Ring Bending Stiffness | 4000 N/m/m |
| Flexural Yield Stress | 24.5 MPa |
| Tensile Yield Stress (50mm/min) | 28 MPa |
| Tensile Yield Strain (50mm/min) | 6% |
| Poisson’s Ratio | 0.45 |
| Thermal Co-efficient of Linear Expansion | 150 x 10-6 / K |
Note: These are typical values, which can be used for buried flexible design purposes. Actual values may vary slightly for different sources of polymer.
Product Details
Product Details
Standards and Approvals
All components of the EziPit® range, including sewer pits, inspection shaft covers, drainage risers, and maintenance holes comply with the following Standards:
- WSA 137 Industry standard for Un-plasticised Polyvinyl Chloride (PVC-U), Polypropylene (PP) and Polyethylene (PE) maintenance shafts, maintenance chambers and maintenance holes for sewerage.
- I.S. EN 13598-2 'Plastics Piping Systems for Non-pressure Underground Drainage and Sewerage – Unplasticised Poly (Vinyl Chloride) (PVC-U), Polypropylene (PP) and Polyethylene (PE) - Part 2: Specifications for Manholes and Inspection Chambers'.
- ISO 13272 ‘Plastics Piping Systems for Non-pressure Underground Drainage and Sewerage – Unplasticised Poly (Vinyl Chloride) (PVC-U), Polypropylene (PP), Polypropylene with Mineral Modifiers (PP-MD) and Polyethylene (PE) - Part 2: Specifications for Manholes and Inspection Chambers in Traffic Areas and Deep Underground Installations.
- EN14396 'Fixed Ladders for Manholes'.
- AS/NZS 5065 ‘Polyethylene and Polypropylene Pipes and Fittings for Drainage and Sewerage Applications’.
- AS 3996 ‘Access Covers and Grates’.
- AS 1646 ‘Elastomeric Seals for Waterworks Purposes’.
These Standards define the material, performance and design requirements for plastic sewer maintenance shafts, chambers and maintenance holes, ensuring adequate structural resistance to site loadings and long term durability in service. The EziPit system is engineered to withstand depths up to 6 m and its watertight performance is verified to resist the equivalent of a 5 m water table.
The following Product Specifications are also relevant:
- WSA PS-315 Fixed Ladders for Man Entry Structures - Water Supply and Sewerage
- WSA PS-337 Maintenance Chambers (MC) – Polypropylene (PP) for Non-Pressure Applications – Gravity Sewerage
- WSA PS-341 Maintenance Shafts (MS) - Polypropylene (PP) for Non-Pressure Applications – Gravity Sewerage
- WSA PS-340 Maintenance Holes (MH) - Polypropylene (PP) for Non-Pressure Applications – Sewerage
- WSA PS–290 Access Covers and Frames for Water Supply and Sewerage to WSA 132
- WSA PS–240 Polypropylene (PP), Ribbed Construction
- WSA PS-230 Polyvinylchloride, Unplasticised (PVC-U) Pipes and Fittings for Non-Pressure Applications - Sewerage and Drainage.
EziPit® maintenance chamber and shaft components are manufactured under a third-party certified Quality Management System (QMS) complying with AS/NZS ISO 9001 and have ISO Type 5 product certification.
The EziPit® has been appraised by WSAA and the product appraisal report No 09/01 Issue 7, ‘EziPit® Polypropylene (PP) Inspection and Maintenance Chambers and Shafts’ was published on the 17 March 2026.
Sewer Maintenance Shaft - EziPit® 425
The EziPit 425 is a gravity sewer maintenance shaft with a 425mm nominal inside diameter, suitable for installation depths up to 6m. It permits safe access for cleaning and sewer inspection equipment from the surface.
DN425 Polypropylene Base: Foundation for Sewer Access
- The base forms the secure foundation for your sewer access point.
The DN425 Polypropylene Base is available with adjustable rubber ring joint sockets compatible with smooth wall DWV PVC-U pipes manufactured to AS/NZS 1260. - The sockets allow the installer to adjust the grade or angle by up to 7.5º in any direction in the trench.
- The pre-benched EziPit® 425 bases are available with six different flow profiles, allowing changes in direction and side inflow connections.
- Standard profiles are 30°, 60°, 90°, straight through (180°), and double sweep X junction profiles for DN150 DWV pipe.
- A straight through (180°) profile is also available for DN225.
DN425 Polypropylene Corrugated Riser
The corrugated riser is key to achieving the required height of the sewer inspection shaft.
- The riser is available in 2m, 3m, and 6m lengths.
- It can be easily cut on-site to adjust the shaft's height.
- The riser is orange/brown in colour.
Cover Arrangements: Sewer Manhole Cover and Lid
The cover arrangement provides the secure seal and access point for your sewer system.
- Cover arrangements are suitable for both heavy-duty trafficable conditions (Class D) and non-trafficable conditions (Class B).
- The covers are made from Ductile Iron (DI).
Cover types available include a Cap and Lid arrangement or Top Hat.
SBR Seals (Styrene-Butadiene Rubber)
- SBR seals are used for a high-performance leak-tight unit, essential for maintaining the integrity of the sewer system.
Riser Inflow Connection
- The connection consists of a moulded polypropylene Riser Junction with 4 dn150 spigot off-takes
- A standard PVC DWV RRJ coupling and level invert taper (LIT) provides an effective joint with the PP spigot off-takes.
Sewer Maintenance Chamber - EziPit® 600
The EziPit 600 is a gravity sewer maintenance chamber designed with a nominal inside diameter of 600mm. It is suitable for installation depths up to 6m, permitting safe access for cleaning, inspection, and maintenance equipment.
DN600 Polypropylene Base
The base forms the secure foundation for your sewer access point.
- The DN600 Polypropylene Base features adjustable rubber ring joint sockets compatible with smooth wall DWV PVC-U pipes manufactured to AS/NZS 1260.
- The pre-benched EziPit® 600 bases are available with six different flow profiles, allowing a change in direction and side inflow connections for the sewer system.
- Standard profiles include 30°, 60°, 90°, straight through (180°), and double sweep X junction profiles for DN150, DN225, and DN300* DWV pipe (*subject to availability).
DN600 Polypropylene Corrugated Riser
The corrugated riser is key to achieving the required depth of the sewer maintenance chamber.
- The DN600 polypropylene corrugated riser is available in a range of lengths to accommodate installation depths up to 6m.
- The DN600 riser is light grey in colour.
Cover Arrangements: Sewer Chamber Cover and Lid
The upper cover arrangement provides a secure cover for the Chamber ensuring safe and reliable access to the sewer system
- Cover arrangements are suitable for both heavy-duty trafficable conditions (Class D) and non-trafficable conditions (Class B).
- Options include a Cap and Lid arrangement or 'Top Hat' Frame.
SBR (Styrene-Butadiene Rubber) Seals
- SBR seals are used for a high-performance leak-tight unit, essential for maintaining the integrity of the sewer system.
Riser Inflow Connection
- The connection consists of a moulded polypropylene Riser Junction with 4 spigot off-takes, 3 x dn150 and 1 x dn225
- A standard PVC DWV RRJ coupling and level invert taper (LIT) for property connections provide an effective joint with the PP spigot off-take.
Sewer Maintenance Hole - EziPit® 1000
The EziPit® 1000 is a sewer manhole designed with a nominal inside diameter of 1000mm. It provides physical access for maintenance and repair.
DN1000 Polypropylene Base: Foundation for Sewer Manhole Access
The base forms the secure foundation for the sewer system access.
- The DN1000 Polypropylene Base features adjustable rubber ring joint sockets compatible with smooth wall DWV PVC-U pipes manufactured to AS/NZS 1260.
- The pre-benched EziPit® 1000 bases are available with seven different flow profiles, allowing a change in direction and side inflow connections.
- Standard profiles include 30°, 60°, 90°, straight through (180°), and double sweep X and Y junction profiles for DN150, DN225, and DN300* DWV pipe (*subject to availability).
DN1000 Polypropylene Corrugated Riser
The corrugated riser is key to achieving the required depth of the sewer maintenance hole.
- The DN1000 Riser is available in 1.2m, 2.4m, 3.6m, and 6m standard lengths with plain ends.
- The riser can be cut off on-site to adjust the shaft's height.
- The DN1000 corrugated riser is orange/brown or light grey in colour.
Cone (Reducing)
- The DN1000 x DN600 Reducing Cone transitions from the 1000mm diameter riser to the 600mm cover arrangement.
- The Reducing Cone is black and made of polypropylene with a grey corrugated riser.
Cover Arrangements: Sewer Maintenance hole Cover and Lid
The upper cover arrangement provides a secure cover for the Maintenance Hole ensuring safe and reliable access to the sewer system.
- Cover arrangements are suitable for both heavy-duty trafficable conditions (Class D) and non-trafficable conditions (Class B).
- Options include a Cap and Lid arrangement or a 'Top Hat' Frame.
Riser Inflow Connection
The riser accommodates specialized in-take branches for property connections and internal drops.
- The PP corrugated riser is prefabricated with either a DN225 (250mm OD) or DN150 (160mm OD) PP spigot in-take branch.
- For DN100 DWV (110mm OD) property connections, a PVC DWV Level Invert Taper (LIT) M&F with a DWV PVC Coupling (F&F) is required.
SBR (Styrene-Butadiene Rubber) Seals
- SBR seals are used for a high-performance leak-tight unit, essential for the integrity of the sewer system.
Design
For the pipeline designs of the EziPit 425 Sewer Maintenance Shaft, EziPit 600 Sewer Maintenance Chamber and the EziPit 1000 Sewer Maintenance Hole, refer to our Technical Guide.
Handling & Storage
Installation & Testing
Installation & Testing
For EziPit® installation and maintenance instructions, see our Technical Guide.
FAQ
Frequently Asked Questions
Case Studies
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