What can I say, it's a toilet fill valve. Install was simplicity personified, didn't even need to adjust float level. Just be sure you get the gray one if your current one is gray, or the black one if yours is black.
Instructions were minimal, but if you have any familiarity with toilets/fill valves/their purpose and general knowledge of how to use tools, all it took was a pair of channellocks and a pair of scissors to install.
Next time, however, I'd probably find a brand that has replaceable
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valves, so no need to replace whole unit. I had a Kohler toilet and I was replacing the original Kohler fill valve, and there are no replaceable parts on them. Fortunately, this is actually cheaper (~$15 vs. ~$20) than generic/well known replacement fill valve.