When is my propane cylinder due for requalification?
Read the stamps on the cylinder collar, answer two questions and get the month it is next due. Free, no sign-up.
Where to find the dates
The date it was made is stamped on the collar near the cylinder's specification marking, such as DOT-4BA240.
A retest stamp shows the month, then the requalifier's four-character code set in a square, then the year. An S or E after it names the kind of retest. Use the newest one.
A visual inspection can instead be marked with the inspector's visual inspection number between the month and year, then E, like 03 V123456 14 E.
Marking rules: 49 CFR 180.213(d), (f) and (g).