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What do A, B, C and D mean on an LPG cylinder? The expiry code explained simply

Confused by the A, B, C or D code stamped on your LPG cylinder? Learn what these letters mean, how the code indicates the ...
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Gas cylinder: Do gas cylinders also have an expiry date? Why are codes like 'A 26' or 'B 27' inscribed on them?

The codes inscribed on gas cylinders do not pertain to their 'expiry date,' but rather to their 'testing date.' LPG cylinders are manufactured in strict adherence to rigorous internal and external ...