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Each DOT marking identified on this page must appear on all cylinders and
must be maintained so that it is legible.
The circled numbers on the graphic correspond to the numbered definitions provided below.
- ICC or DOT marking may appear:
"ICC": Pre-existing marking – "ICC 3AA2015"
"3AA" - specification from 49 CFR 178.37
"2015" - marked service pressure.
"DOT": new manufacture marking must read
"DOT. 49 CFR 171.14."
- "A35798641": Serial number - no duplications
permitted with any particular symbol- serial number combinations.
- "PST": Symbol of manufacturer, user, or purchaser.
- "6 56": date of manufacture. Month and year.
" Ø ": disinterested inspector's official mark.
- "+": indicates cylinder may be 10% overcharged per
49 CFR 173.302(c).
- "5-61" and "5-66": Retest dates.
- "*" (5 pointed star 0: indicates ten year retest
interval.
See 49 CFR 173.34(e)(15).
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