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I have a question - Ratchet recently was kind enough to take my CO2 tanks in for testing and getting them filled, and the date stamp reads the following: "0207411". At a guess, I think the 02 is the month, 07 the day (although it was after the 7th that they were taken in..), and the 11 being the year. Obviously I have no idea and that leaves out the 4... Anyone know how decipher the date codes on these tanks?

02 is the month, 074 is the facility that did the hydro (don brentons), and 11 is the year.

Ah that makes sense. Thanks!

No worries. I used to test scuba tanks, they all follow the same hyrdro test.