Our ABS and PVC specialty products are engineered for unique installations and are offered in a range of sizes and configurations. Systems include expansion joints that compensate for expansion and contraction due to temperature changes, settling of buildings or shrinkage in wood frame building structures.

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Similarly, appliances designed with wheels must not have the wheels rendered inoperable so as to avoid the installation of a hose assembly. Wheels may only be replaced with support legs supplied by the appliance manufacturer in accordance with the manufacturer’s specifications.

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Fitting wheels or castors to appliances supplied with support legs should only be done with the components supplied by the appliance manufacturer and in accordance with the manufacturer’s specifications.

The appliance isolation valves and regulators must also be accessible for the purpose of isolation, servicing and adjustment. Accessible is defined as access being gained without hazard or undue difficulty. This may be achieved by locating the isolation valve and regulator next to the appliance (for example, beneath a bench) or underneath the appliance but brought forwards for ease of access.

A hose assembly for an appliance needs to be connected to the appliance and the consumer piping by a threaded or other metal connection. There are three allowable connection methods depending on the hose assembly setup:

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A hose assembly is to hang freely in a ‘U’ shape. Always avoid strain on the hose assembly and its connections. Figure 1 is what a hose assembly should look like when fully installed (including the restraints and buffers).

Always read the manufacturer’s installation instructions to determine the recommended method of connection. As a general rule, appliances that are not designed to be moved should be connected by rigid pipe.

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Our resources section covers everything you need to know about our Backwater Valves and Specialty Plumbing Products. Take a look at our most popular resources below:

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Whether you are new to thermoplastic solutions or a long-standing customer, your local Customer Service and in-field Technical Sales Representatives provide the support you need. It's this service that distinguishes IPEX in the marketplace.

Commercial catering equipment connected by hose assembly must be restrained to prevent stress being applied to the hose connections when the appliance is moved, where the accepted method of restraint:

The requirements contained within AS/NZS 5601.1 clause 6.10.2.7 will form part of Energy Safe's zero tolerance strategy as of 1 April 2023.

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We acknowledge Victoria's Traditional Owners as the original custodians of the lands on which we work. We offer gratitude and pay respect to Elders past and present.

Warning: any modifications to an appliance outside of the manufacturer’s specifications may void the appliance certification.

Backwater Valve: 1-1/2 – 6″ (40 – 150 mm) Backwater Valve with 16″ access sleeve and lid: 2 – 4″ (50 – 100 mm) Sewer OD and Schedule 40 DWV dimensions

A significant number of the gas applications Energy Safe Victoria receives are for commercial kitchen installations, and a major reason for failed commercial kitchen inspections is the incorrect installation of appliances and hose assemblies. As a result, Energy Safe has provided gasfitters with several aides to help achieve a compliant commercial kitchen installation that include:

Backwater Valves are part of our complete system of pipe, valves, fittings and specialty plumbing products for drainage and waste applications.

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This gas information sheet provides information about installing and connecting commercial catering equipment using hose assemblies. This information sheet is to be read in conjunction with AS/NZS 5601.1:2022 clause 6.10.2.7 which has been updated and now make these requirements mandated.

The hose assembly fixed gas connection should be installed a suitable distance from the appliance connection to create a hanging radius that prevents the hose from kinking.

Expansion joints available in PVC or ABS compensate for expansion and contraction of the system due to temperature changes, building settling or shrinkage in log building structures.

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Available in ABS and PVC, IPEX Backwater Valves offer simple and effective protection against backflow of sewage and storm water into homes and businesses. The Straight-Fit™ valve body design has minimal slope, making it ideal for new installations and retrofits.

Commercial catering equipment must be certified and installed in accordance with AS/NZS 5601.1 Gas Installations Part 1: General installations, but as a quick guide to a compliant installation, any appliance on castors, rollers, wheels, or that is designed to be slid out for servicing must be:

The currency and accuracy of this document cannot be guaranteed once printed or saved to a storage device. If in doubt, please check the ESV website for the current version.

Installing a buffer (or spacer) behind an appliance helps prevent strain, abrasion, or kinking of the hose when the appliance is moved back into position. Given the mobility of the appliance, buffers also ensure that surrounding combustible surfaces (behind and on each side of the appliance) are protected and minimum manufacturer clearances are maintained.