LPG Regulator: When to Replace & How to Change It Safely
How to identify a failing LPG regulator, choose the correct replacement, and safely change it yourself — including the 10-year replacement rule.
What This Is
The LPG regulator reduces bottle pressure to the safe working pressure for your appliances. A faulty regulator causes poor appliance performance and can be a safety hazard.
Tools & Parts Required
- Correct replacement regulator (Calor, Campingaz, or universal)
- Adjustable spanner
- PTFE tape
- Leak detection spray or soapy water
- Cloth
Step-by-Step Instructions
- 1
Identify your regulator type. Calor Butane (blue bottles): 21mm clip-on regulator. Calor Propane (red bottles): POL screw fitting. Campingaz (green bottles): EN417 bayonet fitting. Check the date stamp — if more than 10 years old, replace regardless of apparent condition.
- 2
Replace the regulator if you notice: appliances burning with a yellow or orange flame (correct is blue), gas smell near the regulator, frost forming on the regulator body, appliances with low or fluctuating pressure, or the regulator is more than 10 years old.
- 3
Turn the gas bottle valve clockwise to close. Turn on a gas appliance to release residual pressure — the flame will extinguish as pressure drops. Turn off the appliance.
- 4
For clip-on regulators: press the release button and pull straight up off the bottle valve. For POL fittings: unscrew anti-clockwise (left-hand thread — turn clockwise to loosen). Loosen the hose clip and pull the hose off the regulator outlet.
- 5
For clip-on: press down firmly until it clicks. For POL: screw clockwise (left-hand thread) until hand-tight, then one quarter turn with a spanner. Connect the flexible hose and tighten the hose clip. Apply PTFE tape to any threaded connections.
- 6
Open the bottle valve slowly. Apply leak detection spray (or thick washing-up liquid solution) to all connections. Bubbles indicate a leak — close the bottle valve immediately, tighten the connection, and retest. Do not use any gas appliances until the system is leak-free.
Common Mistakes to Avoid
- Using the wrong regulator for the gas type — Butane and Propane regulators are not interchangeable
- Forgetting that POL fittings have a left-hand thread
- Not leak-testing after fitting — always test before using any appliance
- Using a regulator beyond its 10-year service life
Safety Warnings
- Always work with the gas bottle valve closed and in a well-ventilated area.
- Never smoke or use naked flames near LPG equipment.
- If you smell gas after reconnection, close the bottle valve immediately and ventilate the area.
- Regulators must be replaced every 10 years — check the date stamp on the regulator body.
When to Call a Professional
Any work on the fixed gas pipework inside the vehicle must be carried out by a Gas Safe registered engineer.
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