Noticed this threaded hole above my natural gas hook up on my 7.5 kw generac. I'm getting ready to start it. Should there be a plug in this? See picture

Nothing posted. 
 
A model would help as well for at least the engine...
 
Can you describe where this threaded hole is?
 
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I will have to look and will post that later. I have a photo but it's not uploading?

New members often have to wait to post pic's
 
If you find your engine (a simple search) and post the Link to it, you can post, by the part #, what your looking at..
 
 
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Thank you much appreciated will do

Ok I've searched the web for generac model G0069981 They had no pics but plenty for other models.part # none I could find. I could come up with it's a generic OHV 1 cylinder displacement 420cc.
Product date 20240620. Maybe you tell me the site to go to.

Here's the owners manual. 
 
See if this helps:
https://www.manualslib.com/manual/2370214/Generac-Power-Systems-Powerpact-G0069981.html#manual 
 
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Is this threaded hole in the engine, or the control panel, or?
 
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A picture posted would solve my problem. I'll try contacting customer support.
Thank you everyone

Well I called generac. That was a joke. I went out and looked at the gas regulator. I was looking down that hole for an adjustment screw. I shined a light and you could see the floor. I'm going to have to guess this is a thread to add a propane line?
Anyway it should be safe for me to start.
Thanks everyone for the help