Can the RWAL isolation/dump valve be cleaned? 1990 C3500 2wd

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Yamaben

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1990 C3500 2wd Rear wheel anti lock isolation/dump valve

That thing has a big nut on the end of it, and I was wondering if you can get it apart and clean it? I searched, but it seems like many people just remove it. Are there any threads about disassembly and reassembly of this thing?
 
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