Quick note from unrelated company:
IMPORTANT NOTE: Your tank
MUST be tested and up to date! CO2 tanks must have a hydrostatic test completed every 5 years to ensure they can safely hold pressure. The date of this test is stamped into the top of the cylinder. This means the stamp on your tank must be up-to-date.
WE CANNOT AND WILL NOT FILL OUT OF DATE TANKS. This only results in a hefty fine for us and a dangerous situation for you if you have a faulty tank. Also, we do perform the hydrostatic testing.
When the out of date tank has that new stamped date, will be happy to fill it for you.
Here is an example of the location of the date on a tank:
In this example, the tank can be filled until August 2022, at which point it needs to be hydrostatically tested again. When the test is complete the tank will be stamped with a new date.