I was told the below restricts/governs how much hot water can make it to my tub/shower. I'd like to know what it's called, and how I can adjust it to get hotter water.
I'm attempting to twist the "cap" (the beige-ish color) to the right, but am meeting more resistance than I would have expected (having no knowledge of how it works). I'm afraid to attempt to turn too hard for fear that it is not what I'm supposed to adjust, and I could break/crack the pipe.
Or do I need to find an alan wrench or similar to adjust just the little silver deal at the top?