I believe that is a pilot operated check valve block that helped keep the load from drifting down. Took everything out of the system except the cylinder itself... if the cylinder leaked by the piston, it would settle anyway. The way they work is when pressure is applied to one side, an internal "pilot" line opened the opposite or return side of the line. Again, if the cylinder had an internal leak, this valve didn't help that.
I know Cessna/Eaton made them at one time and many were used on loader buckets to help stop the bucket from dumping the load as it was being carried. You could find them mounted on a cross-beam behind the bucket of a loader. One of these might work if you can find one.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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