This was original equipment from the manufacturer and was a perfect match for my Bell & Gossett 100 series circulator pump. I recommend watching a video on You Tube to better understand how to remove it as the inner ring sits firmly on the shaft pump. It requires a little dexterity with a heavy hammer. Also, when removing the clutch, the HS-105-SM-R4 Technical Manual states that the clutch must be disengaged before the four bolts securing the motor to the bearing assembly can be removed. However, it is difficult to see the adjusting screws. In the video I was watching, the technician removed the set screw on the clutch after removing the four screws from the bearing assembly. He braced the engine and loosened the set screw. Also note that there are two set screws on the clutch. You need the one closest to the engine itself to release the clutch. I give five stars because it came from the manufacturer and was a perfect fit. I redesigned my system to work in zones, so I haven't restarted the pump yet. Also, I think most of the noise is due to the loose flange. My flange gaskets were definitely warped so I replaced them and the flanges on the old pipes. The ones on the pump looked fine.
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