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I Just replaced it with a China cheapo. I did however take is apart and found water had accumulated from leaking air for many years and corroded the internal slide part of the block. 

https://www.amazon.com/dp/B07SHG911C?ref...le_24&th=1

Thanks Jack!
Mine is as clean as a whistle inside, still has some of the grease in it. I took the one out of the bay for my cooler and just pulled it apart and put some fresh grease in it and it stopped leaking. That was just a trial to see if it was the o-rings. I noticed the o-rings in the gen one were deteriorating, so I am hopeful the new spool pieces will work for mine. 
It’s really amazing that mine was not worse, I don’t think they ever changed the air dryer on my coach, but he did mainly use it in the west so maybe it was mostly dry air. I had to fight for several hours to get the air dryer cartridge off. Ended up using a chain wrench to remove it.