Hydac makes the Parker units so that's why they look similar. See pictures below. The pressures for preset of the bladder can be discussed here also. There actually is some science to the preset and the pressure depends on how the accumulator is used.
We will send these first 4 at cost so grab them now if you need them. The price is $295 shipped US domestically. Elsewhere with a quote. We will work on the next batch once these go. For reference, Uvalde was $500 or more for the same part. (Someone had to pay for junior to race at Reno).
With a little effort, the actual cost should be lower but someone made the mistake saying an airplane was grounded.
![frustration :banghead:](./images/smilies/banghead.gif)