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That is the overflow tank from your coolant reservoir.
If you follow the inboard-upper black hose from the coolant reservoir, it runs along the inside of the front fender and enters the top of the overflow tank just under the ABS unit.
Last edited by Carnival Kid; 04-26-2021 at 06:18 PM.
Thanks! I hadn't spotted it's connected at the top I was under there trying to get the cooling fan relay/module out and it didn't look to me like it was connected to anything. I stand corrected. (or rather, I lay on my back in the dirt half under the car corrected)