legal cylinders

[bbradf44]

last night my team was taking inventory and making a list of parts we need to order(yes i know i started a thread over in electronics just like this but this one relates to cylinders). We decided that we need some new pneumatic components. We would like to use cylinders with a 1.5"-3" stroke, the only problem is AM does not sell these(i dont think). I looked on clippard.com and found a great source of them but my question is are these still legal to use? per 2013 rules of course, rules can change i know that