What is an OPSO Regulator and Do I Need One? (UK and Ireland Guide)

If you're installing or upgrading a gas system in the UK or Ireland, you've likely come across the term OPSO regulator. But what does it actually mean—and do you need one?

In this guide, we explain what an OPSO regulator is, how it works, and when it’s required for your gas setup.

What is an OPSO Regulator?

OPSO stands for Over Pressure Shut-Off. It is a safety device built into (or added to) a gas regulator that automatically shuts off the gas supply if the pressure exceeds a safe level.

This prevents dangerous overpressure situations that could damage appliances or create serious safety risks.

How Does an OPSO Work?

An OPSO regulator constantly monitors the gas pressure. If the pressure rises above a set limit (typically 100–150 mbar depending on the system), the OPSO mechanism will:

• Automatically cut off the gas supply
• Prevent gas from reaching appliances
• Require manual reset once the issue is resolved

This added layer of protection is especially important in domestic and commercial LPG installations.

Do I Need an OPSO Regulator?

In many cases, yes—an OPSO regulator is required.

Under current UK gas safety guidelines, OPSO protection is typically needed when:

• The gas supply serves a property (home, caravan, or building)
• You are using bulk LPG or cylinder systems connected to appliances indoors
• You are upgrading or installing a new gas system

If your existing regulator does not have OPSO built in, you don’t always need to replace it—you can add a separate OPSO unit instead.

OPSO Regulator vs Standard Regulator

• Standard Regulator: Controls gas pressure only
• OPSO Regulator: Controls pressure + shuts off gas if pressure becomes unsafe

For most modern installations, OPSO protection is now considered essential.

Can I Add OPSO to My Existing Regulator?

Yes. If you already have a regulator (such as a Cavagna 734) without OPSO, you can upgrade your system by fitting a separate OPSO unit.

This is a cost-effective way to meet current safety standards without replacing your entire regulator.

👉 View compatible options here: OPSO Unit & Safety Device

Common Applications for OPSO Regulators

• Domestic LPG systems
• Caravans and motorhomes
• Static holiday homes
• Commercial catering setups
• Off-grid properties

Not Sure What You Need?

Choosing the wrong regulator or safety device can lead to connection issues or safety risks.

👉 Use our Gas Product Finder Tool to quickly find the right regulator, OPSO unit, or fitting for your setup.

Final Thoughts

An OPSO regulator is a vital safety component for many LPG systems, helping to protect both your appliances and property. Whether you're installing a new system or upgrading an existing one, adding OPSO protection is a smart and often necessary choice.

Browse our full range of gas regulators and OPSO Regulators to find the right solution for your needs.