Gas runs the essentials on your rig: the cooktop, the hot water, often the fridge when you’re off-grid, and sometimes the heater in cold-weather country. Get the bottles, regulator and fittings right and you’ll never think about them again. Get them wrong and you’ll be chasing a leaking POL fitting in a servo car park at 4pm or discovering your regulator has frozen up in the High Country.
This guide covers what to buy, how it all connects, and the specific products worth your money for a big lap.
How your gas system fits together
Every caravan gas system follows the same chain: bottle, then regulator, then the copper or hose lines that feed your appliances. LPG leaves the bottle at high, variable pressure. The regulator drops it to a steady 2.75 kPa, which is what Australian appliances are built to run on. Without a working regulator, nothing downstream is safe.
The connection between the bottle and the regulator matters. Older setups use a POL fitting (a left-hand thread you tighten with a spanner). Newer bottles and regulators increasingly use the LCC27 connection, a hand-tightened fitting with a built-in safety cut-off. If your bottle and regulator don’t speak the same language, you’ll need an adaptor or a matched set.
Check what connection your current regulator uses before buying new bottles. Mixing POL and LCC27 without the right adaptor is the most common gas hassle we hear about.
Choosing gas bottles: size and material
Most caravans carry two 9kg bottles on the A-frame. That’s the sweet spot: a 9kg bottle holds around 17.5 litres of LPG, is light enough to lift and swap easily, and can be exchanged at almost any servo, hardware store or caravan park in the country for around $28 to $38 a swap.
Some larger vans run 4kg bottles for weight savings, and a few full-timers step up to a single 15kg bottle. The problem with 15kg bottles is you can’t swap them as easily; you usually have to refill them, which means finding a depot rather than a swap-and-go cage. For a big lap where you’re moving through remote towns, two 9kg bottles beats one big one every time.
Steel vs composite bottles
Steel bottles are cheap, tough and swappable everywhere. That’s their whole case, and it’s a strong one. Composite (fibreglass) bottles are lighter by 4 to 5kg, don’t rust, and let you see the gas level through a translucent wall. The catch is they cost three to four times more and you generally can’t swap them; you refill them, and some remote depots won’t touch composite bottles at all.
For the average big lapper, steel wins on convenience. If you’re weight-obsessed and towing close to your limit, composites earn their keep. If you’re not sure whether weight is your problem, work through your numbers first.
What to look for before buying
- Connection type: Match your bottle to your regulator. POL or LCC27, not a mix without an adaptor.
- Current test date: Bottles need re-stamping every 10 years. Buy a bottle with plenty of life left, or plan to swap it.
- Auto changeover: A dual-bottle regulator that switches automatically means you never lose gas mid-cook.
- Hose length and rating: Use only AS/NZS approved LPG hose, sized to reach without kinking.
- Bayonet fitting for the BBQ: A wall-mounted quick-connect lets you run an external BBQ off your main supply.
The best gas bottles, regulators and fittings
✔ Pros
- Swappable almost everywhere
- Cheap to buy and refill
- Tough and reliable
✗ Cons
- Heavy at around 8kg empty
- Can rust over years
- No way to see gas level
✔ Pros
- Significantly lighter
- Never rusts
- See-through gas level
✗ Cons
- Three times the price
- Can’t swap, must refill
- Some remote depots won’t fill them
✔ Pros
- Seamless switch to spare
- Empty-bottle indicator
- Swap a bottle without shutting gas off
✗ Cons
- Dearer than a single regulator
- Must be fitted by a licensed gas fitter
Fittings and accessories worth having
You’ll also want a spare POL to LCC27 adaptor in your kit. Swap-and-go bottles in different states occasionally come with different fittings, and having the adaptor on hand saves a wasted trip.
Gas safety and the law
Gas is the one system on your rig where DIY has legal limits. Bottles must carry a current test stamp, valid for 10 years from the last inspection date. Servos and depots won’t fill or swap an out-of-date bottle, so check the stamp on the collar before you leave home.
Any work on fixed gas lines, regulators or appliances inside your caravan must be done by a licensed gas fitter. You can swap bottles yourself, but you cannot legally modify the plumbed system. A dodgy DIY connection can void your insurance.
Two habits keep you safe. First, spray every connection with leak detector after swapping a bottle and watch for bubbles. Second, turn your bottles off at the valve when towing. It takes five seconds and eliminates the risk of a leak developing at highway speed.
Keep a magnetic gas level indicator strip on your steel bottles. It’s not perfect, but it saves lifting and shaking bottles to guess how much is left.
- Two 9kg steel bottles are the best setup for most big lappers: cheap, tough and swappable anywhere.
- Go composite only if you’re weight-limited, and check refill availability along your route.
- An auto changeover regulator is the best upgrade you can make, switching to your spare bottle automatically.
- Match your bottle connection to your regulator, and carry a POL to LCC27 adaptor.
- Keep bottles in test date, spray-test after every swap, and leave gas work on fixed lines to a licensed fitter.
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