It appears that most manufacturers do date mark - how odd that you should get one without a date !
Have you purchased a cheapy-chinky version ?
Richard Hakeem, director of technical and safety policy, at Liquid Gas UK explains regulators play an important role in reducing the pressure of LPG in the cylinder to the much lower pressure required to run the appliance.
“If a regulator fails, it can lead to over pressurisation of the appliance and an accumulation of LPG, which is a fire or explosion risk if an ignition is present.
“All regulators should have their date of manufacture stamped or marked on them and should be replaced in accordance with the manufacturer’s instructions. If the instructions have been lost or do not give such information the regulator should be replaced not more than ten years after manufacture.”
And from Flogas ..........
When should an LPG regulator be replaced?
Industry guidance recommends replacing LPG regulators every 10 years from the date of manufacture, unless the manufacturer’s instructions say otherwise.
If you are not sure how old your regulator is, look for the date marked on it.
If you can’t find it, or you would rather have an expert check it for you, it is best to speak to a Gas Safe registered engineer.
And Calor Gas ...................
Calor gas regulators are date marked. They typically have a date of manufacture stamped on them, which helps ensure they are safe and effective for use.
It is important to replace regulators that are more than 10 years old and to follow the manufacturer's instructions for replacement.