Cat 1.1 oil leak

[Dwellonroof]

I recently purchased a Scag turf tiger with a cat 1.1 diesel (28 hp) and noticed an oil leak at what seems to be a bolt or plug, I'm afraid to remove it thinking it might be holding the cam shaft.
Does anyone know if I can remove it without removing the valve cover? Does it have an o'ring or washer to seal it?
Thanks in advance.

 

[Dwellonroof]

Update:
Went ahead and decided to see if I could fix the leak without taking anything else apart and found that it was only a plug with an O ring so I replaced the O ring and put a little axle grease on it before I installed it.
No Leaks!!!