Understanding the specific types of fittings used in the Australian RV industry is the first step in ensuring a leak-free and compliant setup:

• Flare Fittings: These are the gold standard for caravan gas plumbing. They feature a $45^\circ$ tapered cone that creates a high-pressure, metal-to-metal seal. Because they don’t rely on rubber washers, they are incredibly resistant to the “rattle” of corrugated roads.

• Bayonet Fittings: These are “quick-connect” points usually mounted on the caravan’s chassis. They allow you to plug in an external BBQ or stove without tools. They feature an internal valve that automatically shuts off the gas flow the moment the hose is twisted and removed.

• Inverted Flare: Frequently found on the inlet of gas regulators, these require a specific pigtail connection to ensure a gas-tight fit between the bottle and the regulator.

The biggest shift in Australian gas safety is the transition from the old POL (Type 21) valve to the LCC27 (Large Cylinder Connection). By 2026, this is the standard found at every “Swap ’n’ Go” and refill station across the country.

• Integrated Safety Valve: Unlike the old style, gas will not flow from an LCC27 bottle unless a hose is fully and correctly threaded on. This prevents gas leaks if a bottle is accidentally left open.

• Thermal Protection: The LCC27 connector includes a thermal fuse. In the event of a fire, the internal seal melts and automatically shuts off the gas supply.

• Right-Hand Thread: While old POL fittings were “left-hand thread” (turning counter-clockwise to tighten), the new LCC27 outer thread is a standard right-hand thread, making it more intuitive for most users.

The “No Tape” Rule: Never use thread tape (Teflon tape) or sealant on Flare or LCC27 fittings. These are designed to seal on the internal seat or mating surface. Adding tape to the threads can prevent the components from seating properly, which actually causes leaks.

• Yellow PTFE Tape Only: If you are working with threaded pipe joins (NPT or BSP), you must use Yellow PTFE tape. This is thicker and specifically rated for gas, whereas standard white plumber’s tape can be dissolved by LPG over time.

• Avoid Adaptors: In Australia, using adaptors to convert old POL bottles to new LCC27 hoses (or vice versa) is highly discouraged and, in many commercial contexts, illegal. They add extra failure points and bypass modern safety features.

• Brass is Best: Always use high-quality brass fittings. Brass is spark-resistant and “soft” enough to create a perfect seal when tightened, making it the only choice for Australian gas systems.

• The Soapy Water Test: Every time you swap a gas bottle or move camp, spray your connectors with a mixture of water and dish soap. If bubbles form, you have a leak. Even a tiny “micro-leak” can empty a 9kg bottle over a few days.

• Dust Caps are Critical: Always keep the dust cap on your chassis-mounted bayonet fitting when not in use. Road grit, mud, or spiders getting into the connector can damage the internal O-ring, leading to a permanent and dangerous leak.

• Hand-Tighten First: To avoid “cross-threading” (which ruins the brass), always start threading your connectors by hand. They should spin easily for several turns before you need to apply a wrench or firm pressure.

While Australian owners are permitted to connect their own pigtails and BBQ hoses, any permanent gas plumbing—such as copper lines or fixed appliances—must be installed and certified by a licensed gas fitter. Ensure your van carries a current gas compliance plate or certificate to stay legal and covered by insurance.