I was given this Vevor pcp compressor by my neighbor to look at/troubleshoot/fix. He told me it did NOT build pressure; however, I found it didn't even have any air flow. I took it apart and quickly saw that a "part or piece" was missing from the top of the cylinder head. Can anyone tell me what part I need? Tried searching for a parts diagram - found nothing. Unit powers up, fans run and compressor functions, but obvious that air is escaping out of this threaded hold. Any help would be appreciated. I'm new to pcp - on my 3rd day!
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