If anyone can provide me information about this part right here, please tell me.
It is a high pressure seal and bearing unit.
The metal assembly to the right with the yellow parts is the drive coupling.
After Sam’s comment and looking at that part again, there are 3 distinct metal parts - the middle one with the holes is aluminium, while the outer two are the outer races of the two bearings.
Two bearings are often used due to either the load, controlling end float or controlling play or vibration in the shaft.
Combined thrust bearing and shaft seal / stuffing box. Yes, it's really called that.
The nipple on top is to inject lubricant which has dual function of preventing water ingress to engine compartment.
The thrust unit forward loads cannot be transferred to drive shaft / engine without:
- or serious design compromise
The thrust bearing transfers these loads to the housing which is of course secured to the hull & framing. This also improves thrust vector geometry.
It's a boat jet engine. And as Solar Mike's answer says, it is a bearing and seal. I guess it is a brush less electrical motor.
Here is a link to an eBay ad. ElectricalJet motor