May I ask what kind of self-priming pump this is?
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The device has a self-priming pump, but I don’t know much about it. What kind of self-priming pump is this? The red arrow is what the self-priming pump is, and the green arrow is what the self-priming pump is. What is its function? As shown in the picture
The red one is the drain valve. The green one is the exhaust valve.
Sealless self-priming pump solenoid valve for exhaust
You can check the structure diagram of the sealless self-priming pump
The upper port is for tank pump, and the lower port is for sewage discharge.