[cwl1979]

Believe it or not there is a big difference between brands. Parker O ring face seals don't work with Eaton. You have to really crank on things to "make" it work. I once blew a hose at -20 and had to go to the nearest place to get a new one. It was an Eaton store, I ended up getting new fittings for the cylinder as well. Once you find a brand you like, stick with it forever. Parker is more common.