The Complete Guide to CPAP Hoses: Universal Fit for All Masks - Except One main image The Complete Guide to CPAP Hoses: Universal Fit for All Masks - Except One image

The Complete Guide to CPAP Hoses: Universal Fit for All Masks - Except One

Your CPAP hose does one job, every night: deliver pressurised air from your machine to your mask. When it works, you barely notice it. When it cracks, kinks, or loses pressure, your therapy stops working — and you wake up tired wondering why.

This guide covers what you need to know about CPAP hoses: the difference between 22mm and 15mm tubing, when you can swap a hose between machines, why the ResMed AirMini is the one exception to nearly every rule, and how to keep your hose performing for as long as it should.

What a CPAP Hose Does

The hose is the link between your CPAP machine and your mask. It carries a continuous stream of pressurised air, set to the prescription level your sleep physician programmed into your machine. Without it — or with a hose that leaks, kinks, or has cracked along the way — the therapy your machine is doing simply doesn't reach you.

Hoses also do a second job that many users never think about: they manage humidity. Heated tubing keeps the warm, moist air from your humidifier from cooling and condensing inside the tube, which is the cause of the dreaded "rainout" — water droplets ending up in your mask. Non-heated tubing is fine in temperate or dry conditions, but in cold rooms or humid climates, heated tubing makes a real difference to comfort.

CPAP Hose Sizes Explained: 22mm Cuffs vs 15mm SlimLine

Two dimensions matter when talking about CPAP hose sizes — and they are often confused with each other.

The 22mm cuff is the diameter at each end of the hose, where it connects to the machine outlet and the mask elbow. This is the industry-standard connector size used by nearly every CPAP machine and mask on the market. It is what allows masks from one brand to be used with machines from another. Standard tubes and SlimLine tubes both use 22mm cuffs at the connection points.

The body diameter is the internal width of the tube itself — either 22mm (standard) or 15mm (SlimLine). This is what differs between hose types, and it matters because your CPAP machine adjusts air pressure based on which body diameter you are using. A 15mm tube has more internal resistance than a 22mm tube, so the machine compensates by pushing air slightly harder to deliver your prescribed pressure at the mask.

22mm tube connector port on the ResMed AirSense 11 CPAP machine
ResMed AirSense 11 — 22mm tube outlet
22mm tube connector port on the ResMed AirSense 10 CPAP machine
ResMed AirSense 10 — 22mm tube outlet
22mm tube connector port on the Fisher & Paykel SleepStyle+ CPAP machine
Fisher & Paykel SleepStyle+ — 22mm tube outlet

The takeaway: 22mm cuffs connect to almost every mask and machine, but the body diameter of the tube needs to match what your machine expects. Always use the manufacturer-specified tube for your CPAP machine to ensure accurate pressure delivery.

Standard vs SlimLine CPAP Tubing

This is one of the most common questions we get, and it deserves a clear answer.

Standard CPAP tubing has a 22mm body diameter. It is heavier, slightly stiffer, and offers less internal resistance. Most older machines and many current ones use standard tubing as the default. It is also the option used with most Fisher & Paykel and Lowenstein machines.

ResMed SlimLine tubing has a 15mm body diameter. It is noticeably lighter and more flexible, which reduces pull on your mask when you turn over in bed. SlimLine still uses 22mm cuffs at each end, so it physically connects to any mask.

Here is the technical point that matters: if your machine supports SlimLine tubing (most modern ResMed AirSense models do), the machine adjusts its internal pressure algorithm to compensate for the smaller body diameter. The pressure delivered to your mask is the same whether you use standard or SlimLine tubing — the machine just works a little harder to push air through the narrower SlimLine tube.

Two caveats. First, you cannot mix tubing types across brands and assume the pressure compensation will work correctly — a SlimLine-style 15mm tube from one brand may not be recognised by another brand's machine. Use the tube specified for your machine. Second, on older machines that do not have a SlimLine setting, fitting a 15mm tube may result in slightly under-delivered pressure.

Which one should you choose? If your machine supports SlimLine and you want a lighter, less obtrusive setup, go SlimLine. If you have an older machine, are using a Fisher & Paykel or Lowenstein machine, or simply prefer the more robust feel, stick with standard tubing.

Types of CPAP Hoses

Beyond standard and SlimLine, hoses are also classified by whether they are heated and which machine they are designed for.

Non-heated tubing — The simplest option. No electrical connections, no settings to configure. Suitable for users without a humidifier, or in temperate climates where rainout is not a concern. Available as standard 22mm or SlimLine 15mm.

Heated tubing — Has an electrical connection at the machine end and an internal heating element that warms the tube wall, preventing condensation inside the hose. Required when using a humidifier in cool or humid conditions.

The most common heated tubing options on Australian machines are:

The ResMed AirMini Exception

The ResMed AirMini is the smallest travel CPAP machine on the Australian market, and it is the one exception to nearly everything covered above. It does not use 22mm cuffs, it does not work with standard tubes, and it does not work with most masks.

The AirMini tubing uses a proprietary snap-in connector at both ends. It is shorter, narrower, and engineered specifically for the AirMini's compact design. You cannot connect a standard CPAP hose to an AirMini, and you cannot connect an AirMini tube to any other machine.

The same proprietary design extends to masks. The AirMini works only with masks that have a ResMed AirMini-specific connection — either built into a setup pack or available as a separate AirMini connector:

ResMed AirMini connected to a standard CPAP hose via the ZephAir Universal CPAP Hose Connector
ZephAir Universal CPAP Hose Connector — adapts the AirMini for use with a standard hose

If you want to use a standard mask with your AirMini — say you already have a mask you love and don't want to buy an AirMini-specific version — the ZephAir Universal CPAP Hose Connector is a third-party adapter that lets you connect a standard 22mm hose to the AirMini. Worth knowing: using the ZephAir adapter bypasses ResMed's HumidX waterless humidification system, since HumidX sits inline with the proprietary AirMini tubing. Most travellers find the trade-off acceptable, but if HumidX is important to your therapy, stick with ResMed's AirMini-specific masks and tubing.

CPAP Hose Compatibility by Machine Brand

A quick reference to the right tubing for the most common machines sold in Australia:

  • ResMed AirSense 10 / 11: ClimateLineAir or ClimateLineAir 11 (heated), or SlimLine and Standard tubing (non-heated)
  • ResMed S9: ClimateLine for S9 (heated) or SlimLine — the heated tube is not interchangeable with newer AirSense versions
  • ResMed AirMini: AirMini tubing only (proprietary)
  • Fisher & Paykel SleepStyle / SleepStyle+: ThermoSmart AirSpiral heated tubing
  • Philips Respironics DreamStation: DreamStation 15mm Heated Tube
  • Lowenstein PrismaLINE: Prisma HYBERNITE heated tube (standard or slimline variants), or Prisma Standard Breathing Tube for non-heated

The general rule: use the heated tubing designed specifically for your machine. The connectors at the machine end are not interchangeable between manufacturers, and even within a brand the heated tubing connector can change across generations.

How to Choose the Right CPAP Hose

If you're replacing a hose, the decision is usually straightforward:

  1. Match your machine. Identify your CPAP make and model. The heated tubing options are machine-specific.
  2. Heated or non-heated? If you use a humidifier and have ever experienced water in your mask or hose, you need heated tubing. If you don't use a humidifier, or live in a warm dry climate year-round, non-heated is fine.
  3. Standard or SlimLine? If your machine supports SlimLine (most modern ResMed AirSense machines do), and you want a lighter setup, choose SlimLine. Otherwise standard tubing.
  4. Length. Most CPAP hoses are 1.8–2 metres, which suits most bed setups. If you sleep far from a power outlet or want extra slack, longer hoses are available — but be aware that very long hoses can slightly reduce pressure delivery and increase condensation risk.

Cleaning and Maintenance

Hoses don't need a daily clean, but weekly maintenance keeps them performing well. Disconnect the hose from both the machine and the mask, then wash with warm water and a small amount of mild detergent. A dedicated CPAP tube cleaning brush makes it easier to reach the full length of the tube interior.

Rinse thoroughly with fresh water and hang the hose to air-dry fully before reconnecting it. Tube drying hangers and dedicated drying racks help the hose drain and dry evenly. Never use harsh chemicals, alcohol, bleach, or ozone — these can degrade the tube material and create health risks. We have a full guide to how often you should clean your CPAP equipment if you'd like more detail.

When to Replace Your CPAP Hose

ResMed's Australian replenishment guide recommends replacing your CPAP tubing every 12 months as part of routine equipment maintenance. Replace your hose sooner if you notice any of the following:

  • Visible cracks, splits, or holes
  • The tube has become stiff or lost flexibility
  • Discolouration that doesn't wash out
  • A persistent musty smell even after cleaning
  • Connector cuffs that no longer seal tightly to the machine or mask
  • Whistling or audible air leaks during therapy

A failing hose causes therapy pressure to drop without you noticing — and pressure that drops below your prescription means your sleep apnea events are no longer being treated effectively. If you've started feeling tired again or your AHI numbers have crept up, your hose is worth checking before you assume it's the machine.

Frequently Asked Questions

Are all CPAP hoses the same size?

The cuffs at each end are nearly always 22mm in diameter, which is the industry standard. The body of the tube can be either 22mm (standard) or 15mm (SlimLine). The ResMed AirMini is the one exception — it uses a proprietary connector that is not 22mm.

Can I use any CPAP hose with any machine?

For standard 22mm tubing, generally yes — the cuffs fit nearly all machines and masks. However, heated tubing is machine-specific because the electrical connector differs between brands and even between generations. Always check that the heated tube is designed for your CPAP machine.

SlimLine vs standard tubing — which is better?

Neither is objectively better. SlimLine is lighter and reduces drag on your mask, which most people find more comfortable. Standard tubing is more robust and works on any machine, regardless of age or brand. If you have a modern ResMed AirSense and want a less obtrusive setup, choose SlimLine. Otherwise standard works fine.

Is the pressure the same through SlimLine and standard tubing?

Yes — provided your machine supports SlimLine and is configured to recognise it. The machine's internal pressure compensation algorithm adjusts to deliver your prescribed pressure at the mask, regardless of which tube body diameter you are using. On older machines without a SlimLine setting, fitting a 15mm tube can cause slightly under-delivered pressure.

How often should I replace my CPAP hose?

ResMed's Australian replenishment guide recommends every 12 months. Replace sooner if you notice cracks, stiffness, discolouration, a musty smell, or loose connections.

Can I use a standard hose with my ResMed AirMini?

Not directly — the AirMini uses a proprietary connector. A third-party adapter such as the ZephAir Universal CPAP Hose Connector lets you connect a standard 22mm hose, but doing so bypasses ResMed's HumidX waterless humidification.

What's the difference between ClimateLineAir and ClimateLineAir Oxy?

They are functionally identical for therapy. The Oxy version adds an integrated oxygen port at the mask end of the tube, allowing supplemental oxygen to be added to the air flow. It is used by patients on combined CPAP and oxygen therapy.

Choose the Right Hose for Your CPAP

Your hose is one of the simplest parts of your CPAP setup, but a worn or wrong hose can quietly undermine your therapy. Match the hose to your machine, replace it once a year (or sooner if it shows wear), and clean it weekly — and it will do its job without you having to think about it.

Browse our full range of CPAP tubing, setup kits, and heated tubes at CPAP Tubes & Setup Kits. If you're not sure which hose suits your machine, our team can help — feel free to get in touch.