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I guess I was asking what the holes in the middle of the cartridge are for. I have the general idea of how it works.

Me and my Dad recently replaced one. I was wondering how they work. Are there any diagrams of how the water flow works. So far my understanding is that the hot and cold water come to the same point and based on which way you turn it, the water will mix to be hotter or colder. From looking at the...