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Iplex has developed RestrainTM PVC-U sewer pipe specifically for gravity sewer applications utilising trenchless techniques for the installation, repair or replacement of underground infrastructure. RestrainTM is a rubber ring jointed PVC-U pipe, with a threaded spigot and socket, which provides immediate axial capability during installation.



RestrainTM sewer pipe is suitable for installation by a range of trenchless methods including;

  • Horizontal directional drilling (HDD)
  • Pipe reaming or pipe eating
  • Static pipe bursting or cracking
  • Auger boring or guided boring
  • Micro-tunnelling

RestrainTM sewer pipe is not suitable for use with pneumatic or concussive pipe bursing is also unsuitable for pipe ramming or impact moling

Iplex Restrain PVC U Sewer Technical Guide Australia Updated - Jan 2022


The threaded spigot and socket provides immediate axial restrain. The rubber ring seal is seated in a groove behind the spigot thread to ensure that the rubber sealing ring is not dislodged during installation.

Restrain sewer pipe is compatible with both solvent welded and rubber ring jointed DWV PVC-U sewer pipe and fittings conforming to AS/NZS 1260.

Features Benefits
Threaded socket and spigot joint Provides immediate axial restraint during installation using trenchless methods, saving time
Compatible with conventional DWV PVC sewer fittings to AS/NZS 1260 Allows simple connection to maintenance shafts and service laterals
Two directional installation capability pipe can be either pushed or pulled into place to suit installation methodology
High performance rubber sealing ring Minimises the risk of leakage and root intrusion
Conforms to AS/NZS 1260 Use with full confidence
Manufactured from PVC-U Suitable for installation on flat grades, is certified Best Environmental Practice PVC and qualifies for GBCA Green Star PVC credit Points
Produced in stiffness class SN16 Suitable for use in deep installations
Material Options

Material Options

Mechanical Properties
Property Value & Unit
Density 1530 kg/m3
Ultimate Tensile Strength 52MPa
Compressive Strength 66MPa
Ring Bending Modulus (3min) 3200MPa
Ring Bending Modulus (50 yr) 1400MPa
Hardness (Shore D) 85 (ASTM D2240)
Yield Strain 5.5%
Poisson's Ratio 0.38
Thermal Properties
Property Value & Unit
Max Continuous Service Temperature 50°C
Specific Heat 1045 J/kg/°C
Thermal Conductivity 0.138-0.150 W/m/°C
Coefficient of Thermal Expansion 7 x 10-5 / °C
Vicat Softening Temperature Approx. 80°C

PVC-U pipe is non-conductive and cannot be used for earthing electrical equipment.

Property Value & Unit
Volume Resistivity 1016 (60% RH)
Surface Resistivity 1013 - 1014 ohm
Power Factor (at 20°C) 0.015 - 0.020
Dielectric Constant (at 25°C) 3.4 - 3.6 (60 Hz)
Temperature Effects

PVC-U pipe is suitable for service temperatures between 0°C and 50°C, it's self-extinguishing and does not support combustion when the source of ignition is removed.

PVC-U pipe should not be used for continuous service temperatures above 50°C, as deformation of the pipe may result.

Impact Strength

PVC-U sewer pipes have good impact resistance, however at very low temperatures (eg. Below 5°C) the impact resistance of PVC-U pipes is reduced. Hence, when installing pipes at low temperatures extra care should be taken when handling and inserting.

PVC-U pipes are however installed in some of the coldest regions of Europe and North America in large quantities without difficulty.

Chemical Resistance

PVC-U sewer pipes have high resistance to a wide range of chemical reagents. Such resistance, however, is a function of temperature, concentration and pressure.

In general, PVC-U is suitable to convey strong acids, alkalis and aqueous solutions (except those which are strongly oxidising), aliphatic hydrocarbons, fluorides, photographic and plating solutions, brine, mineral oils, fats and alcohols. The suitability of a pipeline for conveying a certain chemical will depend on such factors as the concentration of the chemical in the fluid to be conveyed, temperature, flow rate, the presence of pockets or "dead spots" in the pipeline and other factors.

RestrainTM sewer pipes should not be used with aromatic or chlorinated hydrocarbons, ketones, esters and ethers.

View the Iplex Chemical Resistant Tool

Product Details

Product Details

Standards and Approvals

RestrainTM sewer pipe is manufactured to the Australian Product Standard under a third party accredited quality assurance program complying with ISO 9001

RestrainTM sewer pipe has ISO Type 5 third-party StandardsMark certification ,licence number SMKP20185 in accordance with AS/NZS 1260 "PVC-U pipe and fittings for drain, waste and vent application"

View Iplex Product Certifications

Rubber Ring Seals

Rubber ring seals are nitrile butadiene rubber (NBR),which conforms to the requirements of AS 1646 "Elastomeric seals for waterworks purposes" NBR rings have a high resistance to sewerage as well as mineral oils.

The rubber ring seal is supplied loose and should be stored to ensure that it is not damaged. The rubber ring seal should be placed in the pipe spigot groove during the pipe jointing process.

Colour and Markings

RestrainTM sewer pipe is manufactured in a light grey colour with a semi-gloss finish which is opaque and flawless.

RestrainTM sewer pipes are marked in accordance with AS/NZS 1260 PVC-U pipes and fittings for drain, waste and vent application'. Markings include:

  • Manufacturers name and brand name
  • Nominal pipe Size
  • SN16
  • Date of manufacture
  • Manufacturers code
  • AS/NZS 1260

RestrainTM sewer pipes are repeatedly marked in accordance with AS/NZS 1260.

Environmental Credentials

RestrainTM sewer pipe is certified to conform to the Best Environmental Practice PVC (BEP PVC) provisions of AS/NZS 1260.

The Green Building Council of Australia (GBCA) has defined the standards for best practice environmental performance for PVC manufacturing, against which Iplex's processes have been audited by an independent certifying body. This permits Restrain sewer pipe users to claim positive PVC Credit Points under the GBCA's Green Star rating scheme. Learn More

Restrain™ PVC-U Sewer Pipe Range and Dimensions

RestrainTM sewer pipe is available in nominal diameters from DN100 up to DN300. The product is defined by overall length in order to facilitate on site requirements. The effective length of the pipe is the overall length less the thread length ("B").

Iplex Restrain™ PVC-U Sewer Pipe Dimensions

Restrain™ PVC-U Sewer Fittings Range

Restrain™ PVC-U sewer pipe is compatible with Iplex’s range of PVC-U DWV sewer fittings with both rubber ring and solvent weld joints.


Restrain™ PVC-U Sewer Pipe - Pipeline Design
Handling & Storage

Handling & Storage

Restrain™ PVC-U Sewer Pipe - Handling and Storage
Installation & Testing

Installation & Testing

Restrain™ PVC-U sewer pipe - Installation and Testing

Frequently Asked Questions

Is Restrain™ sewer pipe compatible with DWV pipe and fittings?

Yes RestrainTM sewer pipe is fully compatible with DWC pipe and fittings manufactured in accordance with AS/NZS 1260 "PVC-U pipe and fittings for drain, waste and vent application"

How is Restrain™ sewer pipe tested ?

RestrainTM sewer pipe is tested in the same manner as conventional DWV sewer pipe. Refer to AS/NZS2566.2 "Installation of flexible pipeline", AS/NZS 2032 "Installation of PVC pipe systems", WSA02 Sewerage Code of Australia and/or project specific documentation.

Can I solvent weld Restrain™ sewer pipe to DWV sewer pipe and fittings?

Yes RestrainTM sewer pipe has the same outside diameter as conventional DWV sever pipe and can be solvent welded to DWC pipe and fittings with accordance with AS/NZS 1260 "PVC-U pipe fittings and drain, waste and vent application". Ensure that the spigot or socket thread has been cut off before jointing to the solvent weld pipe or fitting.

Why can't I use rubber ring pipe lubricant on the thread and rubber ring

The threaded joint requirment specific long lasting lubricanting properties that are not provided by conventional pipe jointing lubricants.

Why is a different pulling head necessary?

The pulling head allows the drilling mud in the bore hole to be pushed into the annulus between the pipe and the hole. It also protects the end of the RestrainTM sewer pipe. Wind-up pulling heads designed for PE pipe may be unsuitable for RestrainTM sewer pipe as the internal engagement grooves may be unable to effectively grip the hard PVC surface. Crossbolt style pulling heads are therefore recommended.

Enquire about Restrain


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