Hi there, My name is Nesim and today I will try to answer your question: "After how long the regulator of LPG gas should be changed". Now, regulator is the main part of your LPG gas slender and if it is not working then you should change this. Approximately every 5 years you should be changing this. But if it is still working and it is still good then you should check this out with your agency people because they should be able to help you out. Hope this answers your question, Best regards, Nesim