- Last Updated: 31 August 2022
A POL gas fitting (POL fitting) is found on POL cylinders, POL valves, POL gas regulators and various POL connection fittings including hoses and adaptors.POL valve fittings are found on gas bottles ranging from small BBQ bottles to large commercial gas bottles.
POL Valve Fittings & Gas Bottle Fittings: What is a POL gas fitting? What is a POL Valve on Propane Tank
• A POL gas fitting (POL fitting) is the most common type of valve & gas bottle fitting, in Australia, for most LPG gas cylinders from 4kg to 210kg, including45kg LPG cylinders.
• POL refers to a type of gas valve and to gas bottle fittings that have a POL gas fitting (POL fitting).
• “POL” is an acronym for the company that first made the valves — Prest-O-Lite.
• A POL valve fitting on propane tank refers to the main valve and the same as a POL fitting on LPG gas cylinders.
• The POL gas bottle fittings connection is notable for its reverse — left-handed — thread.
• A pressure relief valve is incorporated within the POL valve for safety.
There are a few more features of the POL valve fitting of which you should be aware…
POL Gas Fitting – POL Fitting
A POL gas fitting (POL fitting) is an LPG gas connection fitting typically used on LPG (propane) gas cylinders. POL fittings can be found on larger size home gas bottles, as well as on BBQ gas bottles. POL is the acronym for the company that first made the valve fittings – Prest-O-Lite.
The female POL gas bottle fitting (POL fitting) is incorporated into a POL valve fitting on the LPG-propane cylinder, utilising a left-handed or reverse thread. The male POL gas fitting is used on pigtail connectors, BBQ gas regulators and other hose style connectors.
At one time POL gas bottle fittings were used in many countries, including the USA, but have faded in popularity. Now Australia is the most notable POL valve fitting user.
OPD Valves for Propane Tanks – Propane Tank Overfill Valve
An OPD propane tank has an OPD cylinder valve. OPD is the acronym for “Overfill Protection Device” or “Overfilling Prevention Device”. An OPD valve is best described as a propane tank overfill valve.
As the name suggests, an OPD valve has a protective mechanism, that prevents propane tank overfill, built into the valve.
OPD valves are used in the USA, instead of POL valves.
Gas Regulator Gas Pressure
A gas regulator controls the regulator gas pressure at which the LPG is delivered from the gas bottle. BBQ gas regulators typically come equipped with an attached gas hose.
The gas regulator screws directly into the gas bottle whilst the gas hose is attached to the BBQ.
The standard BBQ gas regulator type in Australia is a gas regulator with a POL fitting, which has a male POL gas fitting (POL fitting is reverse or left-handed thread) that fits a ‘POL’ valve on the gas bottle.
POL Gas Fitting (POL fitting) – Gas Line Connection
The gas line pigtail or regulator has a POL gas fitting that screws into the large female threaded opening on the side of the valve. A POL fitting is unique in that it has a left-handed or reverse thread. So, to tighten a POL gas fitting, you turn the connector anti-clockwise.
Tightening is achieved either with a wrench or by turning a hand wheel.
You should always do a soapy water leak test after every POL fitting reconnection.
Gas Connection Seal – POL Gas Fitting (POL fitting)
The POL gas fitting (POL fitting) was originally designed as a metal to metal compression seal. However, some connectors are now manufactured POL fittings with rubber O-rings to further improve the seal.
The downside is that these can become damaged or deteriorate over time so they should be checked regularly.
Gas Valve Hand Wheel
Located on the top of the POL valve fitting, the gas valve hand wheel controls the flow of gas, once the connection is secure.
Turning the hand wheel anti-clockwise starts the flow of gas but you should avoid turning it hard to the open stop.
Opening the valve 2 or 3 turns is all you need.
You shut the gas off by turning the hand wheel clockwise, tightening firmly by hand only.
CAUTION:Never open the valve when unattached
POL valve fittings (POL fitting) are equipped with a bleed screw for decant filling, such as when having a BBQ bottle filled at a service station.
It is a small slotted screw on the side of the valve.
The filling technician opens the screw during filling to determine proper filling.
On the other hand, most large gas depots fill cylinders by weight, on digital scales, so the bleed screw is not used.
CAUTION:Never open the bleed screw on your gas valve
The POL valve fitting (POL fitting) has a tube that sticks down into the cylinder, called a ‘dip tube’. It extends down to the bottom of the ullage area.
This tube is connected to the bleed screw and let’s the filling technician know when the cylinder is filled up to the ullage zone.
Ullage is the 20%unfilled space at he top of the gas cylinder that allows for expansion of the gas.
Pressure Relief Valve
The pressure relief valve is the single most critical safety feature on anLPGcylinder. It is incorporated within the POL valve fitting (POL fitting) and appears as the protrusion opposite the main connection.
It usually incorporates some kind of plastic dust cover that should be left in place.
Pressure relief valves are designed to relieve excess pressure that might result from overfilling or exposure to excessive heat or fire.
The function of a pressure relief valve is to keep a cylinder from rupturing in the unlikely event of excessive pressure build-up.
The pressure relief valves are held in the closed position by the force of a powerful spring inside.
As long as the pressure is less than that of the spring, the valve will remain closed.
Having the pressure relief valve releasing gas is a rare event.
Most people will never experience venting.
If the pressure rises beyond the force of the spring, the valve will open to vent the excess pressure.
If this happens, you may hear a hissing sound and see cold gas vapour being released.
Once sufficient pressure is released, the valve closes.
If this ever happens, just stay clear of the area and let the gas dissipate.
You should also call your LPG supplier, from a safe location, and advise them that your gas cylinder is venting gas.
Do not use your mobile phone, any electrical devices or other ignition sources near a venting gas cylinder.
BBQ Gas Bottle Fittings Incorporate POL Gas Fittings (POL fitting)
BBQ gas bottle fittings incorporate POL gas fittings and involve less components than home installations, with typical BBQ gas bottle fittings being a gas regulator with a POL fitting and a hose.
The gas regulator, with a POL gas fitting (POL fitting), and hose usually come as an assembly but hoses are also sold alone.
Some outdoor appliances also require Piezo electric ignitors, various fitting adapters, natural gas conversion kits,
BBQ Gas Leak Test
It is important to regularly leak test your BBQ gas bottle, gas regulator and hose.
Leaks from these items are frequently the cause of BBQ gas fires.
How to Test
Put some soapy water in a spray bottle.
Turn on the gas bottle without turning on the BBQ.
Next, spray the entire valve, gas regulator and hose assembly with the soapy water.
Bubbles will form if there is a gas leakand you may also smell the gas.
When done, rinse with clean water to remove the soap solution.
For more details, please see:BBQ Gas Leak Test
Hot To Safely Attach or Change Your BBQ Gas Bottle
Connecting & Disconnecting Your Gas Regulator
The male connector of a gas regulator, with a POL gas fitting, has a reverse or left-handed thread. So, to detach, you turn the POL fitting clockwise and then anti-clockwise to re-attach.
Full step-by-step instructions:
How to Attach or Change Your BBQ Gas Bottle
View More LPGGas Blogs
Comments, questions or feedback?
Please Email us at:[emailprotected]
The information in this article is derived from various sources and is believed to be correct at the time of publication.However, the information may not be error free and may not be applicable in all circumstances.
A POL gas fitting (POL fitting) is an LPG gas connection fitting typically used on LPG (propane) gas cylinders. POL fittings can be found on larger size home gas bottles, as well as on BBQ gas bottles. POL is the acronym for the company that first made the valve fittings – Prest-O-Lite.What is a pol valve on a propane tank? ›
POL Valve. The POL valve is the oldest. The threads on this propane valve are on the inside of the connector and needs a wrench to be tightened. A plug is screwed into the propane valve for transporting or storing the tank. POL valves allow the release of gas without anything connected to it.Are all gas regulators the same? ›
Each regulator is designed to fit a specific type of cylinder valve and a regulator that fits one type of valve will not fit any of the others. The valve on Propane cylinders has a screw thread and only accommodates Propane regulators.How do you adjust a gas cylinder regulator? ›
How to Install a Cylinder Regulator - YouTubeWhat size is Pol fitting? ›
The POL fitting (derived from the manufacturing company, Prest-O-Lite), is found on larger 4kg to 9kg cylinders. This is a female fitting and points out sideways from the bottle.What does Pol stand for? ›
abbreviation for. petroleum, oil, and lubricants.What does POL fitting stand for? ›
P.O.L is actually and abbreviation for Prest-O-Lite, for the company that first produced the valve. This style of connector you will tighten the connector of the regulator pigtail by turning the fitting counter-clockwise, and you usually need to use a wrench to make the connection tight enough to prevent leaks.What kind of valve is on a 20 lb propane tank? ›
LP OPD valve has a 4.0 Dip Tube and fits most typical 20# propane tanks, most typically used for barbequing. Type 1, standard.Do different size propane tanks need different regulators? ›
It does not matter if you have a large propane tank or a small 5 gallon propane cylinder, almost all applications require a pressure regulator. A word of caution - one size does not fit all applications. One regulator may work well on a gas grill but may be too small for a home heating system.How do I know which gas regulator I need? ›
How to choose a gas regulator. Check the appliance itself or the original paperwork for guidance. There should be a data plate outlining the required gas throughput and inlet pressure. Check the type of gas you're using.
- Gas type – What type of gas are you regulating? ...
- Inlet and outlet pressure – What is the inlet and desired outlet pressure? ...
- Gas flow – What is the gas flow range? ...
- Pipe size – What is the pipe size? ...
- Altitude – Altitude affects regulator sizing.
Gas regulator types include LPG gas regulator, acetylene gas bottle regulator and oxygen gas bottle regulator. The gas regulator setup can include bayonet fittings, pol gas fittings and other gas regulator fittings suitable for a variety of gas appliances and equipment such as MIG welders.How do you read a regulator on a gas cylinder? ›
Regulators with Gauges
Some regulators have one gauge, some have two. Regardless, you will always have a gauge displaying outlet pressure, which is the gas coming out of the valve. If your regulator has two display gauges, the second one will read the inlet pressure, that's gas pressure going into the tank.
When regulator is letting out gas by opening the cylinder valve, it is mechanically interlocked and would not be possible to remove it in normal course. If mechanism of interlocking is broken for some reason, you would not be able to open the gas stream from cylinder.Can pressure regulator increase pressure? ›
The regulator can only increase pressure if additional pressure is available. If you notice a problem with the water pressure in your home, it could mean that you might have to make a few adjustments to the water pressure regulator.What is Pol CGA 510? ›
Description. POL (CGA-510) Cap – Brass cap for protecting the threads on propane pigtails and hogtails.What is pol in chemistry? ›
POL. Petroleum, Oils, and Lubricants.What is Pol hose? ›
UL / CSA approved Type 1 propane hose assembly with POL (no excess flow) x POL (no excess flow) fittings. Used to conduct natural gas in a gaseous state and propane in either a liquid or gaseous state up to 350 PSI. Call for lead times.What does Pol mean in construction? ›
POL. Point on Line (surveying)