Not the HPs but I like to say "a free hydro with every fill" with the LP tanks.... LOL just kidding of course.... I would never fill my tanks above rated pressure... :)
Printable View
Not entirely accurate since hydro measures the amount of stretch in a cylinder and more importantly how that stretch comes back to original size. :)
If it ain't broke, don't fix it. ie-air goes in and out smoothly.