i rebuilt my manifold in there and it is considerably more complex and with more to it than the picture russ has. but, when the compressor shuts off from getting up to the correct air pressure, the air solenoid at the bottom of the plastic bowl (dryer) will open and it causes air to purge the water in the bowl out to a reservoir tank. at the same time another solenoid isolates the tank. the whole thing also becomes the air purge for head of the compressor so it can start easily the next time.
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