They might serve the same purpose, but depending on your setup certain gas fittings can deliver better results.

There are several reasons why switching to natural gas is a smart choice. You’ll reap many benefits like convenience and cost effectiveness and, if you choose to sell your property, gas plumbing will also increase its resale value. Plus, not only will you invest in your own financial future, but as it’s more environmentally friendly, you’ll also be playing your part in protecting the future of our planet.

Whether you want to run a new gas plumbing line or install a kitchen appliance to an existing line, you’ll need to use the right tools. One of which is gas fittings. These small parts play a key role in ensuring that your gas plumbing job gets completed quickly and easily. While they might serve only one purpose (to link gasses with the right lines), there are various types of fittings that you get.

They shouldn’t be confused with other fitting types used for general plumbing, though. Unlike other types of fittings, gas fittings are reverse threaded. This is a crucial feature as it prevents gas from connecting to air or water per accident.

To help you ensure that you use the right type of gas fitting for your setup, here’s a quick overview of the main types of gas fittings and their uses.

Most common types of gas fittings


If you have two similar pipes, you can use a coupling to connect them. You’ll need to use solvent welding, soldering, or threading to connect them, though.


If you have two pipes that are different sizes or materials, you’ll need an adapter. With the help of some soldering or welding, you can use an adapter to connect two differently sized pipes.

Elbow fittings

If you need to change the direction of the piping, you’ll need an elbow. Similarly to the human elbow, this type of gas fitting can help you to achieve various angles. Most of the time, 90 and 45 angles are used, but 22.5-degree elbows are also available.


Cross gas fittings (also called four-way connections) can either offer one inlet and three outlets or one outlet and three inlets. However, they aren’t that steady. This means that if there’s a temperature change, this type of fitting can put a lot of stress on the pipe. So, they’re not used that commonly for plumbing purposes.

Compression fittings

A compression fitting can be used to connect thin-walled pipes without using heat, making them a popular choice because they’re so easy and quick to install. However, if you’re going this route, the gas fitter must be certified, and you might also need to get a permit. Also, keep in mind that they’re not that strong. So, it’s best suited for instances where they won’t have to bend/flex or where they will be left undisturbed after installation.

Selecting the Right Gas Fitting Type

A Quick Guide to Types of Gas Fittings

A Quick Guide to Types of Gas Fittings

Not only should you know which type of gas fitting is the right one for your use case, but you’ll also need to get the size and material right. For example, if it’s too small, the seal could leak, which can pose a safety hazard to your loved ones. On the other hand, if it’s oversized it will be incompatible with the current gas piping that you have.

To size the fitting correctly, you’ll need to know the size of the pipe to which you’ll need to connect it. Though, you’ll need to keep in mind the outside diameter of the pipe (the nominal pipe size) as well as the inner diameter/wall thickness (the schedule number).

The pipe size can either be in inches or millimeters. So, it’s key that you double check the unit of measurement to ensure that it’s compatible with the other parts.

Gas fittings can also be made from various types of material. Plastic, cast iron, and black steel are only some of the materials that can be used. Just like the wrong size can lead to leaks, so too can selecting the incorrect material. For example, for natural gas, black steel is the most common material. Not only is it affordable, but it’s also extremely durable to ensure that gas will be transported safely. Though, if you use galvanized pipes (and not copper or PVC plastic that gas pipes are usually made of), the general principle is not to use black steel. The reason for this is that when the galvanized steel peels off (which it will later do), it could clog the regulator.

Let Fluid Plumbing worry about the technical details

Selecting the right gas fittings requires serious thought. There’s a huge difference between one inch and one millimeter! So, it’s best to get a plumber who specializes in the installation of gas lines. As a matter of fact, in Australia, it’s actually illegal to complete any gas plumbing if you don’t have the relevant license. Considering that selecting the wrong gas fitting can lead to early corrosion or leaks which can lead to fatal accidents, it’s to be expected that you should have the right training, skills, and equipment. Sure, anyone can buy gas fittings, but it takes training and experience to know where and how to use them.

The experienced gas plumbers at Fluid Plumbing have been working with homeowners and businesses in Canberra for over a decade already. Our trained plumbers are fully licensed and insured and can install new gas lines, repair existing ones, or add a gas line to an existing line. They’re also trained to install and repair gas-powered appliances like water heaters and to service gas pipes (which we recommend you do once a year).

If you have a gas fitting project coming up, feel free to call us on 0411169327 or complete this form for a fast free quote.