Leaking from feeding pipe tap to Combiboiler

Leaking from feeding pipe tap to Combiboiler

Leaking from feeding pipe tap to Combiboiler

Please excuse my lack of knowledge of correct terminology.
I found a leak from an opening from the pipe feeding into my combiboiler.
Sorry if I am not clear. Will post a picture.
When I tried to tighten or loosen the knob on top with an adjustable Wrench and
a plyer, it is stuck and slipping. Have applied some vinegar soaked cloth on it to loosen the connection.
I do not need this tap. Can I just put some blocker or Sealant in the hole to stop the leak or any other ideas please.
Thanks for...

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by macgyver

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