The dryer and wet tank are two separate items.
Before air dryers, the wet tank collected the wet air. It was drained often.
The air dryer almost eliminates that.
If your looking for a separate wet tank, you may not find it. They often install a dual tank.
It can be identified by two drains and a weld seam about 1/3 down the lenght. The wet section will have a hose from the air dryer going to it.
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