how does my water pump work?

I had my bike parked in the garage went for a quick ride when i came back to park it i noticed a small amount of coolant on the ground so i looked around and saw that it was leaking out of my water pump gasket but i noticed my pump only has one port and i was wondering how does this pump work with only one port?

does the inlet come from inside the impeller and the outside the port is the discharge that is the only way i see it working

2014 Polaris SPORTSMAN 800 EFI 6X6 (A14CF76AA) Engine, Oil Pump & Water Pump | Babbitts Polaris Partshouse

Attached Thumbnails

Click image for larger version

Name:	3_1.png
Views:	N/A
Size:	1.7 KB
ID:	25895