Most LPG cylinder installs end up with the same pile of parts at the wall: an isolation valve, a separate test point, a bracket to hold the lot, and a few threaded joints to tie it all together. Every one of those joints is a potential leak and another thing to check.
There's a quicker way. A single outdoor gas valve with a built-in bleed point and wall bracket does all three jobs. Get one with a press-fit end and you also skip the torch.
This post covers what the valve does, where it sits on a cylinder setup, and what to look for. It uses the Zetco AGA Approved DZR Brass 15mm Press-fit x 15mm Male Straight Body Outdoor Gas Valve with Bleed Point as the example.
What the Valve Does
It's the isolation point between the bottles and the consumer piping. Shut it and the house, van or site is off gas while the cylinders stay connected.
It mounts on the wall at the cylinder station, right next to the regulator. The regulator screws onto the valve, the valve bolts to the wall, and your copper consumer line runs away from it. One fixed point instead of a regulator hanging off a pigtail with a separate valve further down the line.
It's a quarter-turn, full-bore ball valve. It's made for on/off duty only, so don't use it to throttle.
That makes sense on the jobs where cylinders are the only supply:
- Rural and semi-rural homes off the reticulated network
- Caravan parks with a bank of bottles per site or amenities block
- Tiny homes and relocatables
- Small commercial sites like cafés, food vans with a fixed base, and workshops
The Bleed Point
The built-in bleed point is the feature that earns its place. Hook your manometer straight onto it to set the regulator and take pressure readings at the bottles.
Zetco's listing says readings can be taken with the valve open or closed. In practice:
- Commissioning: set and confirm regulator outlet pressure right at the source, without breaking into the line further down.
- Working pressure checks: with the valve open and appliances firing, check what the system is actually delivering under load.
- Fault-finding and service calls: when a customer complains of a weak flame or a heater dropping out, you've got a fixed test point at the regulator. No hunting for one, no pulling a fitting apart.
It also means one less separate test-point fitting to buy and seal. If you're choosing a gauge, our post on digital manometers for gas work covers range and accuracy.
Press-Fit End: No Hot Work at the Cylinders
The copper side is a 15mm (DN15) press-fit connection to AS 3688. Press it on and you're done:
- Flame-free. No brazing at the cylinder station, next to the bottles, against a weatherboard wall or under the eaves.
- Faster. No heat-up, no cool-down, no cleaning flux off afterwards.
- Consistent. A properly made press joint looks the same every time, which makes inspection easier.
Zetco's listing says the valve is for use with Viega, Rothenberger and KemPress V-profile tools only. Check your jaws match before you head to site. Use gas-rated press fittings for the rest of the run, because water fittings aren't interchangeable. We explain why in Water vs Gas Copper Press Fittings, and you'll find gas press fittings in our Press – Gas range.
15mm Male End: Easy Regulator Swaps
The other end is a 15mm (1/2") male thread, ISO 228/1 G (BSPP) parallel, and that's where the regulator connects.
When the regulator needs replacing or servicing, you unscrew it from the valve and leave everything else alone. The copper stays put, the bracket stays on the wall and the press joint is never disturbed. A PTFE washer seals the connection, so you're not relying on thread tape on a parallel thread.
On a caravan park or a multi-site job, that turns a regulator change into a five-minute swap. If you're picking the regulator, see Single vs Dual Stage LPG Regulators or browse our dual stage gas regulators.
Build Quality for Outdoor Exposure
This valve lives outside in the sun, rain and coastal air for decades. According to the listing:
- Forged DZR (dezincification-resistant) brass body. It holds up to outdoor exposure better than standard brass, which can leach zinc and go porous over time.
- Conical PTFE stem seal for extra leak protection at the spindle.
- Blow-out proof stem, so the spindle can't be forced out under pressure.
- PTFE washer for a leak-free seal against the regulator or appliance.
- Integral wall-fixing bracket. No separate bracket, saddle or packer needed.
Zetco lists it as made in Italy under an ISO 9001 quality system. Every valve is pressure tested in production, with additional testing to DVGW VP 614. The rated range is -20°C to 100°C and the maximum pressure is 2100 kPa. The listing also notes that under AS 5601 Table 4.1, consumer piping containing copper operates at 200 kPa, so the valve has plenty of headroom.
Approvals
The valve is listed as AGA approved. For your compliance paperwork, take the certificate number from the product markings or packaging and check it against the current certification register. Install it to AS/NZS 5601 and your local technical regulator's requirements, as you would on any gas job.
The Short Version
One fitting, one bracket and one press joint replace a valve, a test point, a bracket and several threaded connections. There's no flame near the bottles, and future regulator swaps are quick.
Have a look at the Zetco outdoor gas valve with bleed point. You can find the rest of the cylinder station in our Gas Components, Gas Pigtails and Gas Cylinder collections. Trade account holders can call or email PSA for volume pricing on multi-site jobs.
Frequently Asked Questions
Where does the outdoor LPG isolation valve go on a cylinder installation?
At the cylinder station, fixed to the wall next to the regulator. The regulator screws onto the valve's 15mm male thread, and the 15mm press-fit end connects to the copper consumer piping.
Can I take pressure readings with the valve closed?
Yes. Zetco states that readings can be taken through the bleed point with the valve either open or closed. That makes it useful for setting the regulator at commissioning and for later fault-finding.
Which press tools work with this valve?
The listing specifies Viega, Rothenberger and KemPress V-profile tools only. Check your jaws match before installing.
Can I use it to throttle gas flow?
No. It's a full-bore, on/off-only ball valve and isn't intended for throttling.