What type of pump is this based on its pump body structure?
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What kind of pump is this? What are the bolts at the front and back of the pump body used for?
It should be a centrifugal pump; the components at the front and back are likely used to fix the impeller bearings
Self-priming pump, thread plug, exhaust, water filling
It should be a self-priming pump. The plug is used for exhaust and water injection.
This is a self-priming pump; used for exhaust at the screw connection
Centrifugal pump with a water storage tank, also known as a self-priming pump
For the CPXP self-priming pump, looking from the inlet side toward the motor, the plug in the upper right corner is the filling port; fluid needs to be poured in during the first use, otherwise self-priming will not be possible
It is clearly a self-priming pump, with the exhaust at the top and the liquid filling port at the back.
For centrifugal self-priming pumps, the screw at the top should be connected to the pump chamber; its purpose is to fill the pump for the first time.